The difference in lengths between the steel and copper bars at 41.0°C is 8.729 mm.
The difference in the lengths of the two bars can be calculated using the linear expansion equation;
ΔL = α × L × ΔT
where; ΔL = Difference in length
α = Coefficient of linear expansion
L = Initial length
ΔT = Change in temperature
Given; Initial length (L) = 1.500 m
Change in temperature (ΔT) = 41.0°C - (-12.0°C) = 53.0°C
The coefficient of linear expansion for steel is typically around 11 x 10⁻⁶ /°C, and for copper, it's around 16 x 10⁻⁶ /°C.
For the steel bar;
α (steel) = 11 x 10⁻⁶ /°C
For the copper bar;
α (copper) = 16 x 10⁻⁶ /°C
Now we can calculate the difference in lengths for both bars.
For the steel bar;
ΔL (steel) = α (steel) × L × ΔT
ΔL (steel) = 11 x 10⁻⁶ /°C × 1.500 m × 53.0°C
For the copper bar;
ΔL (copper) = α (copper) × L × ΔT
ΔL (copper) = 16 x 10⁻⁶ /°C × 1.500 m × 53.0°C
Converting the length difference from meters to millimeters (1 m = 1000 mm):
ΔL (steel) = 11 x 10⁻⁶ /°C × 1.500 m × 53.0°C × 1000 mm/m = 8.729 mm (rounded to three decimal places)
ΔL (copper) = 16 x 10⁻⁶ /°C × 1.500 m × 53.0°C × 1000 mm/m = 12.168 mm (rounded to three decimal places)
Therefore, the difference in the lengths of the two bars will be 8.729 mm.
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A teacher has given a lab student a white chemical sample and asks her to confirm that it contains 33.4 g sodium hydroxide (NaOH). If the teacher provides the amount in formula unitswhich value is correct?
A. 40.0 g
B. 46.78
C. 5.03 x 10^23
D. 7.03 x 10^24
The amount in, formula unit. of 33.4 g sodium hydroxide is 5.03 x [tex]10^{23[/tex] . Option C.
Formula unitsIn order to calculate the mass of NaOH from formula units, first, we need to know the molar mass of NaOH, which is 40 g/mol1.
The formula units are related to moles by Avogadro’s number which is 6.022 x 10^23 formula units per mole.
Therefore, we can calculate the mass of NaOH as follows:
33.4 g NaOH = (33.4 g NaOH / 40) x (6.022 x 10^23) = 5.03 x [tex]10^{23[/tex] formula units.
In other words, there are 5.03 x [tex]10^{23[/tex] formula units in 33.4 g sodium hydroxide.
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A population of comb jellies has members that show two distinct traits. One part of the population has male comb jellies that use a complex bioluminescence pattern to attract females. Another part of the population has male and female comb jellies that produce light in quick flashes. A new animal that preys on comb jellies enters the area.
Using Table 1, which statement describes the most probable change in the comb jelly population over time due to the introduction of the new predator?
Only comb jellies whose genes mutate to no longer glow will survive and pass on this trait. This describes the most probable change in the comb jelly population over time. Therefore, the correct option is option A.
The term "population" is frequently used to describe the total number of people living in a particular location. To estimate the number of the resident population inside a certain territory, governments conduct censuses. The phrase has particular use in the domains of ecology and genetics and is also used to refer to plants, animals, and microbes.
A population is frequently referred to as a group of organisms in genetics where any two individuals can breed with each other. A breeding group known as a gamodeme is one that may routinely exchange gametes to create children who are normally viable. Only comb jellies whose genes mutate to no longer glow will survive and pass on this trait. This describes the most probable change in the comb jelly population over time.
Therefore, the correct option is option A.
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Rank the following elements by increasing Ionization energy: Cs, Sn, W, Xe
(1 being small, 4 being large)
pls help me with homework!!!
The ranking of the elements by increasing ionization energy is; Cs < Sn < W < Xe.
Xenon (Xe) has the highest ionization energy among the given elements. It is a noble gas in Group 18 of the periodic table and has a full complement of valence electrons, making it very stable and difficult to remove an electron.
Tungsten (W) has higher ionization energy compared to tin. It is a transition metal in Group 6 of the periodic table and has even more valence electrons, which are held more tightly by the increased effective nuclear charge, resulting in higher ionization energy.
Tin (Sn) has higher ionization energy compared to cesium. It is a metal in Group 14 of the periodic table and has more valence electrons, which are closer to the nucleus, requiring more energy to remove.
Cesium (Cs) has the lowest ionization energy among the given elements. It is in the alkali metal group (Group 1) of the periodic table and has only one valence electron, which is relatively far from the nucleus, making it easier to remove.
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How do you prepare a solution of sugar 342g/mol. 0.45 in 50ml
0.01 mol/L is the molarity of given solution. 0.002 moles is added to 0.2 L solvent to make desired solution.
The amount of moles of solute found in a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Solutes are simply substances that can be found in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.
molar mass =342g /mol
number of moles=mass of solute / molar mass
0.45 /342 =0.002 moles
Volume solution = 50 mL / 1000 =0.2 L
M = n / V
M = 0.002 / 0.2
M = 0.01 mol/L
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A weather balloon is filled with 28.6 L helium at sea
level where the pressure is 1.00 atm at 20.0 °C. The
balloon bursts after ascending until the pressure is 26.0
torr at -50.0 °C. Determine the volume (in L) at which
the balloon bursts.
The volume in which the weather ballon bursts is 640.21L.
How to calculate volume?The volume of a gas given the temperature and pressure can be calculated using the combined gas law as follows:
PaVa/Ta = PbVb/Tb
Where;
Pa, Va and Ta = initial pressure, volume and temperature respectivelyPb, Vb and Tb = final pressure, volume and temperature respectivelyAccording to this question, a weather balloon is filled with 28.6 L helium at sea level where the pressure is 1.00 atm at 20.0 °C.
1 × 28.6/293 = 0.034 × Vb/223
0.0976109215 × 223 = 0.034Vb
Vb = 21.767 ÷ 0.034
Vb = 640.21L
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-physical and chemical methods
of monitoring the rate of
chemical reaction
Physical methods include monitoring temperature, pressure, and color change. Chemical methods include titration and gas analysis.
What are methods of monitoring chemical reaction?Monitoring the rate of chemical reactions is important to understand the kinetics of the reaction and optimize the reaction conditions. Physical and chemical methods are used for this purpose.
Physical methods include measuring the change in temperature, volume, and pressure of the reactants and products with time. The rate of reaction can be calculated from the rate of change of these parameters.
Chemical methods include monitoring the concentration of reactants and products with time. This can be done by techniques such as spectroscopy, chromatography, and electrochemistry. These methods are often more accurate and precise than physical methods.
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What is the vapor pressure of SiCl4
in mmHg
at 33.0 ∘C
? The vapor pressure of SiCl4
is 100 mmHg
at 5.4 ∘C
, and ΔHvap
= 30.2 kJ/mol
.
The vapor pressure of the SiCl₄ in the mmHg at the 33.0 °C is the 312 mmHg.
The Clausius - Clapeyron equation is as :
ln ( P₂ / P₁ ) = ΔHvap / R ( 1 / T₁ - 1 / T₂ )
P₂ = P₁eˣ
Where,
The temperature, T₁ = 5.4 °C = 278.55 K
The temperature, T₂ = 33.0 °C= 306 K
The pressure, P₁ = 100 mmHg
ΔHvap is the heat of the vaporization = 30.2 kJ /mol = 30200 J/mol
The gas constant, R = 8.314 J / mol K
x = ΔHvap / R ( 1 / T₁ - 1 / T₂ )
x = 30200 / 8.314 ( 1/ 278.55 - 1/ 306 )
x = 1.05
P₂ = 100 [tex]e^{1.05}[/tex]
P₂ = 312 mmHg
The vapor pressure of the SiCl₄ is 312 mmHg.
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Based on the following equation:
3 H₂ + N₂ - 2NH3
If 3.24 moles of ammonia gas are produced, how many moles of hydrogen gas were consumed in the reaction?
The process used 4.86 moles of hydrogen gas to generate 3.24 moles of ammonia gas.
How to determine moles consumed?According to the balanced chemical equation, the stoichiometry of the reaction shows that 3 moles of hydrogen gas (H₂) react with 1 mole of nitrogen gas (N₂) to produce 2 moles of ammonia gas (NH₃).
So, for every 2 moles of NH₃ produced, we need 3 moles of H₂ consumed. Therefore, to determine the moles of H₂ consumed, set up a proportion:
3 moles H₂ / 2 moles NH₃ = x moles H₂ / 3.24 moles NH₃
where x is the number of moles of H₂ consumed.
Solving for x:
x = (3 moles H₂ / 2 moles NH₃) x (3.24 moles NH₃) = 4.86 moles H₂
Therefore, 4.86 moles of hydrogen gas were consumed in the reaction to produce 3.24 moles of ammonia gas.
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A solution containing 0.026 moles of H2O2 at 25.0 °C is placed in a coffee cup calorimeter and
allowed to decompose completely according to the thermochemical equation shown below. The final temperature of the solution is 44.9 °C. Calculate the enthalpy of the reaction shown, in kJ/mol. The mass of the solution is 30.0 g and the specific heat capacity of the solution
is 4.18 J/g°C.
CHEMICAL Formula is in the photo
The enthalpy (in kJ/mol) of the reaction, given that 0.026 moles of H₂O₂ at 25.0 °C is placed in a coffee cup calorimeter is 95.98 KJ/mol
How do i determine the enthalpy of the reaction?First, we shall determine the heat energy of the reaction. Details below:
Mass of solution = 30 gInitial temperature of statue (T₁) = 25 °CFinal temperature of statue(T₂) = 44.9 °CChange in temperature (ΔT) = 44.9 - 25 = 19.9 °C Specific heat capacity of solution (C) = 4.18 J/gºC Heat energy (Q) =?Q = MCΔT
Q = 30 × 4.18 × 19.9
Q = 2495.46 J
Finally, we shall determine the enthalpy of the reaction. Details below:
Heat absorbed (Q) = 2495.46 J = 2495.46 / 1000 = 2.49546 KJMole of H₂O₂ (n) = 0.026 moleEnthalpy of reaction (ΔH) =?Q = n × ΔH
2.49546 = 0.026 × ΔH
Divide both sides by 0.026
ΔH = 2.49546 / 0.026
ΔH = 95.98 KJ/mol
Thus, the enthalpy of reaction is 95.98 KJ/mol
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5. If a beaker contains 15.6 moles of water, H2 O, how many molecules does this represent?
6. How many formula units of PbO are contained in 0.317 moles of lead (II) oxide?
7. 6.01 x 10 25 atoms of cesium, Cs, are equivalent to how many moles of cesium?
8. Determine the number of moles that are represented by 3.54 x 10 21 molecules of sulfur dioxide, SO2 .
If a beaker contains 15.6 moles of water, H[tex]_2[/tex] O, 9.3×10²⁴ are the number of molecules this represent.
The smallest recognisable unit into that a pure substance may be divided while retaining its composition & chemical properties is a molecule, which is a collection of more than one atom.
Until parts made up of individual molecules are reached, splitting of a sample of an item smaller progressively smaller parts does not result in a change regarding its composition as well as its chemical properties.
5.number of molecules= 15.6 × 6.022×10²³
=9.3×10²⁴
6. .number of molecules=0.317 × 6.022×10²³
=1.89×10²³
7. number of moles =6.01 x 10 25/ 6.022×10²³
= 100 moles
8. number of moles =3.54 x 10²¹/ 6.022×10²³
= 0.005moles
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you made 95.41 gram of carbon monoxide, how many moles of carbon did you start with?
Answer:
The balanced equation for the formation of carbon monoxide from carbon is:
C(s) + CO2(g) -> 2CO(g)
The molar mass of CO is 28 g/mol.
First, we need to calculate the number of moles of CO produced:
moles CO = mass of CO / molar mass of CO
moles CO = 95.41 g / 28 g/mol
moles CO = 3.412 mol
According to the balanced equation, 1 mole of carbon creates 2 moles of CO. As a result, the amount of carbon moles is:
moles C = moles CO / 2
moles C = 3.412 mol / 2
moles C = 1.706 mol
So, the initial amount of carbon was 1.706 moles.
Question 21 of 30
What is the frequency of an electromagnetic wave that has a wavelength of
3.7 x 10-11 m in a vacuum? (The speed of light in a vacuum is 3.00 × 108
m/s.)
OA. 8.1 x 1018 Hz
B. 1.2 x 10-19 Hz
OC. 1.1 x 102 Hz
OD. 2.7 x 1010 Hz
SUBMIT
The frequency of the electromagnetic wave is 8.1 x 10 ¹⁸ Hz.
The speed of light in a vacuum is given as 3.00 x 10⁸ m/s. The speed of light is also related to the wavelength and frequency of the electromagnetic wave by the equation:
c = λν
where c is the speed of light, λ is the wavelength, and ν is the frequency.
Rearranging the equation to solve for frequency, we get:
ν = c/λ
Substituting the values given in the problem, we get:
ν = (3.00 x 10⁸ m/s) / (3.7 x 10⁻¹¹ m)
ν = 8.1 x 10 ¹⁸ Hz
Therefore, the frequency of the electromagnetic wave is 8.1 x 10 ¹⁸ Hz, and the correct answer is (A) 8.1 x 10 ¹⁸ Hz.
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1. You dissolve 123g KBr into 689g of water. Calculate the mass percent.
When we dissolve 123g KBr into 689g of water, the mass percent is 15.1 %.
The mass per cent of a solution is defined as the mass of solute in grams per grams of solution, multiplied by 100 so as to get the mass percentage.
The formula of mass per cent is expressed as solving for the molar mass and for the mass of each element present in 1 mole of the compound.
The mass of the solution
= mass of solute (KBr) + mass of solvent (water)
= 123 g + 689 g
= 812 g
123 g KBr present in 812 g solution
Let, X be present in 100 g solution
X = 100 g solution x 123 g KBr/812 g solution
= 15.1 g KBr
= 15.1 % by mass
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2. Do you think it would be easier to communicate information
about weight or mass to an extraterrestrial civilization? Explain.
(Hint: Consider which of these two measurements is constant.)
It would be easier to communicate information about mass to extraterrestrial civilizations.
Communicating about mass and weightMass and weight are two different concepts that are often used interchangeably in everyday language.
Mass is a measure of the amount of matter in an object and is measured in kilograms (kg) or grams (g). Weight, on the other hand, is a measure of the force exerted on an object due to gravity and is measured in newtons (N).
If we were to communicate with an extraterrestrial civilization, it would be easier to communicate information about mass rather than weight because mass is an intrinsic property of an object that does not depend on gravity.
Therefore, mass would be more universal and easier to understand by extraterrestrial civilizations.
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If 6.00 6.00 L of water vapor at 50.2 °C 50.2 ° C and 0.121 0.121 atm reacts with excess iron, how many grams of iron(III) oxide will be produced? 2Fe(s)+3H2O(g)⟶Fe2O3(s)+3H2(g) 2 Fe ( s ) + 3 H 2 O ( g ) ⟶ Fe 2 O 3 ( s ) + 3 H 2 ( g )
The mass of iron(III) oxide produced is 115.29 grams.
To determine the mass of iron(III) oxide produced, we can use the stoichiometry of the balanced chemical equation provided.
The balanced equation shows that 2 moles of iron (Fe) react with 3 moles of water vapor (H₂O) to produce 1 mole of iron(III) oxide ( Fe₂O₃).
Given that we have 6.00 L of water vapor at 50.2 °C and 0.121 atm, we can use the ideal gas law to calculate the moles of water vapor;
PV = nRT, where P is pressure, V is volume, n is moles, R is the ideal gas constant, and T is temperature in Kelvin.
First, let's convert the temperature from Celsius to Kelvin;
T = 50.2 + 273.15 = 323.35 K
Now, we can plug in the values and solve for n;
0.121 atm × 6.00 L = n × 0.0821 atm L/mol K × 323.35 K
n = (0.121 atm × 6.00 L) / (0.0821 atm L/mol K × 323.35 K)
n = 0.361 mol
According to the stoichiometry of the balanced equation, the mole ratio between Fe and Fe₂O₃ is 2:1. Therefore, 0.361 mol of water vapor will react with 2 × 0.361 mol = 0.722 mol of Fe.
Now, we can calculate the molar mass of Fe₂O₃;
Fe₂O₃ = 2 × atomic mass of Fe + 3 × atomic mass of O
Fe₂O₃ = 2 × 55.85 g/mol + 3 × 16.00 g/mol
Fe₂O₃ = 159.70 g/mol
Finally, we can calculate the mass of Fe₂O₃ produced;
Mass of Fe₂O₃ = moles of Fe₂O₃ × molar mass of Fe₂O₃
Mass of Fe₂O₃ = 0.722 mol × 159.70 g/mol
Mass of Fe₂O₃ = 115.29 g
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#27 and #28
Please answer the questions as soon as possible!
The questions are in the image
The order of the resonance structures is C > A > B.
In the order of thermodynamic stability we have A > C >D >B
The compounds have one stereogenic center.
What is a resonance hybrid?The average of all potential resonance structures for a molecule or ion is represented by the hypothetical molecule known as a resonance hybrid.
When a molecule or ion may be described by two or more Lewis structures that only differ in the arrangement of electrons, resonance occurs. In other words, resonance structures have the same atomic arrangement but have different electron distributions.
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A 3-column table with 5 rows. Column 1 is unlabeled with entries A, B, C, D, E. Column 2 is labeled Temperature in degrees Celsius with entries 2.4, 21.5, 39.6, 55.6, 71.2. Column 3 is labeled Volume in cubic centimeters with entries 5.8, 5.8, 6.7, 6.9, 7.4. A student collected the data shown above. Row may represent an error.
Since it reflects no change in volume – it is most likely that the data recorded in row B is erroneous.
How to solveIn order to pinpoint the row with a probable error, we will scrutinize the correlation between temperature and volume.
Typically, whenever there is an increase in temperature, there would be an accompanying escalation in the volume of a given substance.
Let's take a closer look at the values reflected in the table:
From A to B: Temperature rises but the volume remains stagnant.
From B to C: Both temperature and volume show an increment.
Similarly, from C to D, as well as from D to E, we see that for every rise in temperature, there is subsequently more volume illustrated.
Given the dissimilarity between rows A and B – where the former shows a temperature increase while the latter reflects no change in volume – it is most likely that the data recorded in row B is erroneous.
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Which row in the table below is likely to represent an error in the student's data collection?
Temperature (°C) Volume (cm³)
A 2.4 5.8
B 21.5 5.8
C 39.6 6.7
D 55.6 6.9
E 71.2 7.4
Answer:
A student collected the data shown above. Row
✔ B
may represent an error.
Explanation:
edge 2023
Physical methods of monitoring the rate of a chemical reaction
There are several physical methods that can be used to monitor the rate of a chemical reaction are; Spectrophotometry, Conductometry, and Turbidity measurement
Spectrophotometry involves measuring the changes in the intensity of light absorbed or transmitted by a solution during a chemical reaction. Spectrophotometers are used to measure the amount of light absorbed or transmitted by a sample at different wavelengths.
Conductometry involves measuring the changes in electrical conductivity of a solution during a chemical reaction. Conductivity meters are used to measure the electrical conductivity of a solution, which can change as the concentration of ions in the solution changes during a chemical reaction.
Turbidity measurement involves measuring the changes in the clarity or turbidity of a solution during a chemical reaction. Turbidimeters or nephelometers can be used to measure the amount of light scattered by a sample, which can change as particles form or dissolve during a reaction.
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--The given question is incomplete, the complete question is
"What are the physical methods of monitoring the rate of a chemical reaction?"--
Need help with this please it’s due today
Write agree or disagree next to each statement. Explain why you agree or why you disagree
1. Metal atoms don’t have full vallance electron shells, so they try to gain electrons to fill their outer shell.
2. When atoms join together,the bond is either covalent or ionic
3. Oxygen atoms bond together,but this is not because of an atomic force.
4. Covalent bonds happen when an electron moves back and forth between two atoms
5. Ionic bonds occur when an electron is transferred from one atom to another
6. When hydrogen joins with oxygen,a hydrogen bond has been formed.
Answer:
The statements 1, 2, 5 are correct, while the statements 3, 4, 6 are incorrect. It's important to have a clear understanding of the different types of chemical bonds and how they are formed in order to understand the properties and behavior of molecules and compounds.
Explanation:
1. Agree: Metal atoms have partially filled valence shells, which makes them more likely to lose electrons than to gain them. This loss of electrons creates a positive ion with a full valence shell, which is more stable than the original atom.
2. Agree: Chemical bonds are either covalent or ionic. Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.
3. Disagree: Oxygen atoms bond together due to a strong atomic force called a covalent bond. This occurs when the two oxygen atoms share electrons to form a stable molecule of O2.
4. Disagree: Covalent bonds occur when electrons are shared between atoms, but they do not "move back and forth" between the atoms. Rather, the electrons are shared between the atoms to create a stable molecule.
5. Agree: Ionic bonds occur when one atom transfers an electron to another atom. The transfer of the electron creates two ions with opposite charges, which are then attracted to each other.
6. Disagree: A hydrogen bond is a weak electrostatic attraction between a hydrogen atom and an electronegative atom such as oxygen or nitrogen. When hydrogen joins with oxygen, a covalent bond is formed, not a hydrogen bond.
Metal atoms try to gain electrons; Covalent or ionic bonds form when atoms join; Oxygen atoms bond via atomic force.
Explanation:1. Agree - Metal atoms do not have full valence electron shells, so they tend to gain electrons to achieve stability. This process is known as electron transfer or ionic bonding.
2. Agree - when atoms join together, the resulting bond is either covalent or ionic. Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons from one atom to another.
3. Disagree - Oxygen atoms bond together through a force known as the atomic force. This force arises due to the different electronegativities of the oxygen atoms, leading to the formation of a covalent bond.
4. Disagree - Covalent bonds occur when electrons are shared between atoms, rather than moving back and forth between them.
5. Agree - Ionic bonds occur when one atom transfers an electron to another atom.
6. Disagree - When hydrogen joins with oxygen, a covalent bond is formed, not a hydrogen bond. Hydrogen bonds occur when a hydrogen atom is attracted to an electronegative atom, such as oxygen, in a different molecule.
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How many moles of KBr are dissolved in 60.2 mL of a 3.50 M solution?
There are 0.2107 moles of KBr are dissolved in 60.2 mL of a 3.50 M solution.
The molarity of a substance is defined as the number of moles of solute present in 1 litre of a solution.
According to the given data, the molarity of the solution tells us that there are 3.50 moles of KBr in 1000mL of solution. But we only have 60.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 60.2mL:
1000 ml - 3.50 moles
60.2 ml -x = 60.2 ml× 3.50 moles/1000 ml
x= 60.2 ml -0.2107 moles
So, there are 0.2107 moles of KBr.
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How many grams of KBr are dissolved in 72.7 mL of a 0.998 M solution?
You dissolve 123g KBr into 689g of water. Calculate the mass percent.
You dissolve 3 moles KBr into 46 moles of water. Calculate the mass percent
8.63 grams of KBr are dissolved in 72.7 mL of a 0.998 M solution.
To answer first we need to calculate the molar mass of this molecule (KBr):
For this we go to the periodic table and check the molar weight of potassium and bromine:
K: 39.098 g/mol
Br: 79.904 g/mol
So the molar mass of KBr is
= 39.098 g/mol + 79.904 g/mol
=119 g/mol
Now, we know that the solution is 0.998 M, this means that in 1000 ml there are 0.998 moles of KBr. So we calculate the number of moles in 72.7ml:
number of moles of KBr
= 72.7 ml × 0.998 molL⁻¹/ 1000 mlL⁻¹
=0.0725 moles
Now we use the molar mass to calculate the mass in grams in the sample:
mass of KBr
= 0.0725 moles ₓ 119 g/mol
=8.6275 g
≈8.63 g
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C₂H₂ + 5 0₂ 3 CO₂ + 4H₂O
Molar masses
C = 12 g/mol
H = 1 g/mol
O = 16 g/mol
What is the mass of CO₂ formed if 12.00 grams of C3H8 are used in the reaction?
If 5 moles of Na2SO4 react, how many moles of NaNO3 can be produced
The concept stoichiometry is used here to determine the moles of NaNO₃ produced. Chemical stoichiometry refers to the quantitative study of the reactants and products involved in a chemical reaction. Here the moles of NaNO₃ is
Stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to find out the amounts of reactants and products. Here we make use of ratios in the balanced equation.
The balanced equation is:
Co(NO₃)₂ + Na₂SO₄ → 2 NaNO₃ + CoSO₄
1 mole of Na₂SO₄ gives 2 moles of NaNO₃.
So 5 moles of Na₂SO₄ gives: 2 NaNO₃ × 5 mole Na₂SO₄ / 1 mole Na₂SO₄ = 10 mole NaNO₃
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The decay chain of 238U passes through a different isotope of radon, 222 Rn, which has a half-life of 3.8 days. Like 220Rn, 222 Rn is the only isotope in the decay chain that is a gas. Explain why the natural underground decay of 238 U poses a much greater threat of lung cancer than the decay of 232Th.
Both 238U and 232Th are naturally occurring radioactive isotopes found in the Earth's crust, and they undergo radioactive decay by emitting alpha particles. However, the decay chain of 238U includes the isotope 222Rn, which is a gas and can easily be inhaled into the lungs. This presents a greater threat of lung cancer because the alpha particles emitted by 222Rn and its decay products can damage the cells in the lining of the lungs.
Furthermore, 222Rn has a relatively short half-life of 3.8 days, which means that it decays relatively quickly into other radioactive isotopes, including polonium-218 and lead-214, which are also alpha emitters. This continuous decay chain can create a buildup of radioactive particles in the lungs, increasing the risk of lung cancer.
On the other hand, the decay chain of 232Th does not include any gas isotopes, and its decay products tend to be heavy metals rather than alpha emitters. This means that the decay products are less likely to be inhaled into the lungs, and even if they are, they are less likely to cause as much damage as alpha particles.
In summary, the natural underground decay of 238U poses a greater threat of lung cancer than the decay of 232Th because it includes a gas isotope (222Rn) that can easily be inhaled into the lungs, and its decay products are alpha emitters that can cause significant damage to the cells in the lining of the lungs.
Question 17: Put 4.6 grams of Na in 97.4 grams of water to get solution A.
a) Determine the solute in solution A
b) Calculate the percent concentration of solution A
a) The solute in solution A is Sodium (Na)
b) The percent concentration of solution A is 4.72 %
Solute is that component of the solution which gets dissolved therefore here sodium is the solute and water is the solvent. Solute is also the minor component of a solution, the component which is present in less amount.
Percent concentration is simply the grams of solute present in 100 grams of a solution.
To calculate the percent concentration, the formula given below could be used
% concentration = [tex]\rm \dfrac{ Mass \ of \ solute}{Mass \ of \ solution} \times 100[/tex]
= [tex]\frac{460}{97.4}[/tex]
= 4.72 %
Therefore,
a) The solute in solution A is Sodium (Na)
b) The percent concentration of solution A is 4.72 %
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If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 70 days?
Answer:
If the substance has a half-life of 14 days, then we know that after every 14 days, the amount of the substance remaining will be divided by two.
Since 70 days is five half-lives (70 ÷ 14 = 5), we can find the amount of substance remaining after 70 days by dividing the initial amount by 2 five times.
Amount remaining = 10,000 grams / (2^5) = 10,000 grams / 32
Amount remaining = 312.5 grams
Therefore, after 70 days, you will have 312.5 grams of the substance remaining.
what is double displacement
Answer:
What is a double replacement reaction? Double replacement reactions—also called double displacement, exchange, or metathesis reactions—occur when parts of two ionic compounds are exchanged, making two new compounds.
Explanation:
.5 moles of lithium chloride are dissolved in .05 liters of water. What is the molarity of the solution?
0.5 moles of lithium chloride are dissolved in .05 liters of water. 10M is the molarity of the solution.
The total amount of moles of solute found within a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Please explain the difference amongst the terms "solute" and "solvent" before we continue.
'Solution' for making it simpler to comprehend the topics that will follow. Solutes are simply substances that exist in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.
Molarity = moles/volume of solution in liter
= 0.5/ .05
= 10M
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1. Convert 0.780 moles of CaCl2 to a number of formula units.
2. How many moles are in 9.09 x 10 22 molecules of CO2 ?
3. Find the number of moles of magnesium atoms, Mg, that are represented by 2.13 x 10 24 atoms.
show work plss
How many mL of 3.00 M HCI are needed to completely react with 4.85 g CaCO3? The
reaction is: 2HCl(aq) + CaCO3(s)-> CaCl2(aq) + CO2(g) + H20(1)
The amount of volume that is needed to completely react with 4.85 grams of calcium carbonate is 32 mL.
How to calculate volume?The amount of volume needed to complete a chemical reaction can be calculated using the following formula;
molarity = no of moles ÷ volume
According to this question, hydrochloric acid reacts with calcium carbonate to produce calcium chloride, water and carbondioxide.
2 moles of HCl reacts with 1 mole of calcium carbonate. 4.85g of calcium carbonate is equivalent to 0.0485 moles.
0.0485 moles of calcium carbonate will react with 0.097 moles of HCl.
volume = 0.097 mol ÷ 3M = 32 mL
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