Answer:
5.80 mol He 6.02210^23 atoms He/ 1 mol He. This cancels out moles, leaving 3.49*10^24 atoms He. Mass is used as a method of counting atoms.
The number of atoms in 5.80 moles of He is equal to 3.49 × 10²⁴ atoms.
What is Avogadro's number?Avogadro’s number is used to represent the number of entities in one mole of any substance. Generally, these entities are ions, molecules, atoms, electrons, or protons, depending upon the type of reaction or reactant and product.
The value of Avogadro’s constant is found approximately 6.022 × 10²³ mol⁻¹. This number was named after the scientist Amedeo Avogadro after his death.
Given, the number of moles of helium = 5.80
The number of atoms in one mole of He = 6.022 × 10²³
The number of atoms on 5.80 moles of He = 5.80 × 6.022 × 10²³
Total number of atoms = 3.49 × 10²⁴
Therefore, the number of atoms in 5.80 moles of Helium is 3.49 × 10²⁴ He atoms.
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The table below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass (g)
Red 4 12
Green 3 10
Which cube is denser?
Red, because it has more volume and more amount of matter.
Green, because it has less volume and less amount of matter.
Red, because it has less volume and more amount of matter.
Green, because it has less volume and more amount of matter.
Answer:
Red, because it has less volume and more amount of matter.
Explanation:
the answer is "Green, because it has less volume and less amount of matter."
what is the volume in milliliter (mL) of 250 cm3 beaker
Answer:
250mL
Explanation:
The second-order rate constant for the following gas-phase reaction is 0.048 1/MLaTeX: \cdot⋅s. We start with 0.1 mol C2F4 in a 2.31 liter container, with no C4F8 initially present. C2F4 LaTeX: \longrightarrow⟶ 1/2 C4F8 What will be the concentration of C4F8 after 2.1 hours?
Answer:
[tex][A]=0.0026M[/tex]
Explanation:
Hello.
In this case, since the second-order rate law is:
[tex]\frac{dC_A}{dt}=-kC_A^2[/tex]
Whereas the subscript A accounts for C2F4 and its integration turns out into:
[tex]\frac{1}{[A]}= \frac{1}{[A_0]} +kt[/tex]
Thus, for the initial concentration of C2F4 computed via the 0.1 mol in the 2.31-L container:
[tex][A]_0=\frac{0.1mol}{2.31L} =0.043M[/tex]
The final concentration after 2.1 h is:
[tex]\frac{1}{[A]}= \frac{1}{0.043M} +\frac{0.048}{M*s} *\frac{3600s}{1h}*2.1h\\\\\frac{1}{[A]}=\frac{386.1}{M}[/tex]
Solving for the final concentration of C2F4, we obtain:
[tex][A]=\frac{M}{386.1} =0.0026M[/tex]
Best regards.
As chief chemist at Superior Analytical Products (SAP) you must design an experiment to determine the density of an unknown liquid to three (3) significant figures. The density is of the order of 1 g/cm3. You have approximately 7 mL of the liquid and only graduated cylinders and balances are available for your use. Which of the following combinations of equipment will allow you to meet but not exceed your goal?
a. graduated cylinder with +0.1 mL uncertainty, balance with :0.1g.
b. graduated cylinder with ±001 mL uncertainty: balance with 101 g uncertainty.
c. graduated cylinder with t0.01 mL uncertainty balance with t0 01 g uncertainty.
d. graduated cylinder with ±0 001 mL uncertainty, balance with 10001 g uncertainty.
Answer:
The correct answer is a
Explanation:
The formula for density is mass ÷ volume. Hence, a balance is required to determine the mass while a measuring/graduated cylinder is required to determine the volume.
The ideal measuring cylinder and balance to be used should have an uncertainty of just 0.1 ml and 0.1 g respectively. This reduces the chances of the answer gotten from the formula above to be more than 3 significant figures.
For example, if the volume to be used is 4.0 ml and the mass of this volume is 3.5 g, the density will be
Density = 3.5 ÷ 4
Density = 0.875 g/cm³ or 0.875 g/ml
NOTE that cm³ is the same measurement as mL
The answer above is in 3 significant figures
A student was asked to determine the percentage of each component in a mixture of silver nitrate, AgNO3 and magnesium hydroxide, Mg(OH)2. The mass of the sample used was 3.54 g. The student extracted AgNO3 from the mixture with water and separated the insoluble Mg(OH)2 from the solution by filtration. After evaporating the filtrate to dryness, the student recovered and dried the AgNO3, and found that it weighed 1.15 g. After drying the recovered Mg(OH)2, a mass of 2.25 g was recorded. On the basis of the mass of the sample used:
1. Calculate the % AgNO3 in the mixture,
2, Calculate the % Mg(OH)2 in the mixture.
3. Calculate the total mass of the AgNO3 and Mg(OH)2 recovered.
4. Calculate the % recovery of the components, using the total mass of the substances recovered.
5. Calculate the % error for the separation of the components of the mixture.
Answer:
1
[tex]k = 32.5 \% [/tex]
2
[tex]z =63.56 \%[/tex]
3
[tex]m_t = 3.40 \ g[/tex]
4
[tex]j = 96.05 \%[/tex]
5
[tex]e = 3.954 \%[/tex]
Explanation:
From the question we are told that
The mass of the sample is [tex]m = 3.54 \ g[/tex]
The mass of the AgNO3 is [tex]m_s = 1.15 g[/tex]
The mass of Mg(OH)2 is [tex] m_n= 2.25 g[/tex]
Generally the percentage of AgNO3 in the mixture is
[tex]k = \frac{1.15}{3.54} * 100[/tex]
=> [tex]k = 32.5 \% [/tex]
Generally the percentage of Mg(OH)2 in the mixture is
[tex]z = \frac{m_n}{m} * 100[/tex]
=> [tex]z = \frac{2.25}{3.54} * 100[/tex]
=> [tex]z =63.56 \%[/tex]
Generally the total mass of the AgNO3 and Mg(OH)2 recovered is
[tex][tex]m_t = m_s +m_n[/tex]
=> [tex]m_t = 1.15 +2.25[/tex]
=> [tex]m_t = 3.40 \ g[/tex]
Generally the percentage recovery of the components is mathematically represented as
[tex]j = \frac{m_t}{m} * 100[/tex]
=> [tex]j = \frac{3.40}{3.54} * 100[/tex]
=> [tex]j = 96.05 \%[/tex]
Generally the percentage error for the separation of the components of the mixture is mathematically represented as
[tex]e = \frac{m- m_t}{m} * 100[/tex]
=> [tex]e = \frac{3.54 - 3.40}{3.54} * 100[/tex]
=> [tex]e = 3.954 \%[/tex]
identify the type
of reaction
C,H,OH + O2 → CO2 +H2O
A student performs an experiment where gas is collected over water in an upside down graduated cylinder. If the atmospheric pressure is 745 mmHg and the level of water in the graduated cylinder is 14.4 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder? Enter your answer numerically in units of mmHg.
Answer:
601mmhg
Explanation:
Pgas = Patm - hρg
Height of water = 14.4cm
Convert to mm
1 cm = 10mm
14.4 cm =
= 14.4cm × 10mm
= 144mm
hpg = 144 mmhg
Ptotal = Patm - hog
= 745mmhg - 144 mmhg
= 601mmhg
The total pressure of gases inside the graduated cylinder = 601mmhg
Which phase has the greatest structure
A geochemist in the field takes a 25.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 26.° C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 350. mL. Then he filters it and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 3.00 g.
1) Using only the information above, can you calculate the solubility of X in water at 26 degrees Celsius.?
a. Yes
b. No
2) If yes than calculate the solubility of X. Round your answer to 3 significant digits
Answer:
Explanation:
1 ) The solubility can be calculated .
The sample taken from the pool was a saturated solution of mineral compound X because the pool was lined with the crystals of X .
The sample taken was 25 mL . Though it diluted afterwards , the solute contained in it did not change . The solute X was found to be 3.00 g
2 )
3 .00 g of solute X was contained in 25 mL of saturated solution .
solubility of X = 3 / 25 g per mL
= 3 x 1000 / 25 g per L
= 120 g / L
= 1.20 x 10² g / L
3. A student takes an object with an accepted mass of 200.00 grams and masses it on his own balance. He
records the mass of the object as 196.5 g. What is his percent error?
I
Answer:
The answer is 1.75 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual number = 200 g
error = 200 - 196.5 = 3.5
We have
[tex]p(\%) = \frac{3.5}{200} \times 100 \\ [/tex]
We have the final answer as
1.75 %Hope this helps you
What is a single called organism able to do
Answer:
Single-celled organisms are able to carry out all the processes of life without help from other cells. Multicellular organisms carry out their life processes through division of labor. They have specialized cells that do specific jobs.
Explanation:
that might be the answer
Answer:
All single-celled organisms contain everything they need to survive within their one cell. These cells are able to get energy from complex molecules, to move, and to sense their environment. The ability to perform these and other functions is part of their organization.
Hope it helps
Explanation:
what is the major source of energy for the production of electricity in this facility
If an atom has an atomic number of 10 and an atomic mass number of 20, how many protons, neutrons, and electrons does it have?
The possible products of a double displacement reaction in aqueous solution are
(NH4)2S and NaNO3. Which of these possible products will form as a solid in this
reaction?
O A) Neither compound will form as a solid.
B) NaNO3
C) Both compounds will form as a solid.
OD (NH4)2S
Answer:
i believe it to be B. but hope it helps
Explanation:
sorry if im wrong
The possible products will form as a solid in this reaction (NH4)2S. The correct option is D.
What is the double displacement reaction?The double displacement reaction is the reaction in which two reactants create two new compounds by exchanging ions. Precipitates are frequently formed as a byproduct of double displacement processes. One element from the solution and another elements form a precipitate.
According to rules of solubility, the sulfides are usually not soluble in water and sodium nitrate is readily soluble in water, so it is clear that the precipitate is formed by the sulfide group. The solution will be formed by sodium nitrate.
Thus, the correct option is D. (NH4)2S.
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The length is 3 meters, the width is 9 meters, and the height is 2 meters. What is the
volume?
5.
The length is 10 meters, the width is 4 meters, and the height is 7 meters. What is the
volume?
Answer:
3 x 9 x 2 = 54 meters
10 x 4 x 7 = 280 meters
Explanation:
Multiply the length, the width, and the height.
You can multiply them in any order to get the same different result. The formula for finding the volume of a rectangular prism is the following: Volume = Length * Height * Width, or V = L * H * W.
Answer:35 cubes with a length of 7 meters, height of 1 meter, and width of 5 meters.
What is the length of the figure?
✔ 7 m
What is the width?
✔ 5 m
What is the height?
✔ 1 m
What is the number of cubes?
✔ 35 cubes
What is the volume?
✔ 35 cubic meters
Explanation:
How many oxygen atoms are in 4 Fe(C2H302)3?
Answer:
24
Explanation:
The negatively charged subatomic particles that are located in the electron cloud are called
(10 Points)
protons
electrons
neutrons
nucleus
Which statement accurately describes the habitabillity of the planets?
Answer:
Are there suppose to be answer choices?
Explanation:
What is different about beaker 4 compared to beaker 1
Answer:
Graduated cylinder vs Beaker
Both graduated cylinders and beakers are pieces of laboratory glassware that have a specific function. Graduated cylinders typically are more accurate at reading the volumes of the liquid inside. Beakers are better for stirring and mixing liquids
Explanation:
PLEASE HELP ASAP ESSAY WORTH 15 POINTS! ONLY GENIUS!
(Essay Worth 8 points)
(02.03 MC)
Is mass conserved when 200 g of water undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.
Answer:
According to the law of conservation of mass, the mass of reactants will be equal to the mass of the products.
Explanation:
If 850. mL of linseed oil has a mass of 620. g, calculate the density of linseed oil.
Density =
g/ml
Answer:
The answer is 0.73 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 620 g
volume = 850 mL
We have
[tex]density = \frac{620}{850} \\ = 0.7294117647...[/tex]
We have the final answer as
0.73 g/mLHope this helps you
CAN SOMEONE PLEASE HELP ME ASAP!! DOES ANYONE KNOW THE ANSWER TO NUMBER 2
Answer:
What is the question? ...
Knowing that the distances the truck traveled during each segment were 30, 45, 50, and 65 respectively, what was the total distance traveled by the truck?
Help ASAP
Answer:
[tex]Total\ Distance = 190[/tex]
Explanation:
Given
[tex]Distance = \{30, 45, 50, 65\}[/tex]
Required
Determine the total distance
This is calculated by summing up the distance in each segment.
[tex]Total\ Distance = 30 + 45 + 50 + 65[/tex]
[tex]Total\ Distance = 190[/tex]
Answer?????????????????????????????!!?!?!?!,!?!?!?
Answer:
why cant you just say the grasshopper eats the marsh grass the shrew eats the grasshopper and the hawk eats the shrew.
Explanation:
this makes sense to me but im not sure.
Answer:
the hawk eats both the snake and the shrew and so does the snake eat the shrew and frog and ex...
Explanation:
give three examples of turning force that we can see it our day to day life
Answer:
well when you go and open a water bottle 2 put force spanner to rotate a nut. 3 a door whey you are opening it
Explanation:
let me now if all of this answers where helpful
Is this name iron oxide written correctly? Why or Why not?
Answer:
If iron, Fe, and oxygen, O2, are in contact at high enough temperatures (and with plenty of oxygen around), the grey or reddish compound that forms is called iron(III) oxide with the formula Fe2O3
Explanation:
Iron rusts. We all know that. But the chemical reactions behind rust are surprisingly complicated! We will return to them at the end of the course when we discuss corrosion (see section 11.6 in the text). Here, we focus simply on the main compounds formed between iron and oxygen. That there is more than one may surprise you. That there are not an infinite number of them (and in fact, there almost is, as well shall see!) is an example of the law of definite proportion, an idea so central to chemistry it is almost taken for granted today.
If 1.48 g of Cl2 reacts with excess P, what is the total change in enthalpy in kilojoules? 2P+5Cl2⟶2PCl5ΔH=−886kJ
Answer:
-3.72 (or -3.70 depending on what values you used)
Explanation:
First, use the molar mass of Cl2 convert the mass of Cl2 to moles.
1.48 g Cl2(1 mol70.906 g)=0.02087 mol Cl2
Note that we are given ΔH=−886kJ. This refers to the enthalpy change associated with the reaction of 5mol of Cl2 by the balanced equation shown below.
2P+5Cl2⟶2PCl5ΔH=−886kJ
Therefore, to determine the enthalpy change associated with the reaction of 1.48gCl2, divide ΔH by 5molCl2 to determine the enthalpy change per mole of Cl2, then multiply by 0.02087 mol Cl2. (note: if you round up here to .021 mol of Cl2 you will get the final answer of -3.72 later)
0.02087 mol Cl2(−886 kJ5 mol Cl2)=−3.698 kJ
Rounding the answer should to three significant figures, we find that the enthalpy change associated with the reaction of 1.48gCl2 is −3.70 kJ.
Notice that coefficients in stoichiometric equations (indicating numbers of moles) are exact, so they do not constrain the number of significant figures.
The enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.
We'll begin by calculating the number of mole of in 1.48 g of Cl₂. This can be obtained as follow:
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ = 1.48 g
Mole of Cl₂ =?Mole = mass / molar mass
Mole of Cl₂ = 1.48 / 71
Mole of Cl₂ = 0.0208 moleFinally, we shall determine the enthalpy change for the reaction. This can be obtained as follow:
2P + 5Cl₂ —> 2PCl₂ ΔH = −886 KJ
From the balanced equation above,
5 moles of Cl₂ reacted to produce an enthalpy change of −886 KJ.
Therefore,
0.0208 mole of Cl₂ will react to produce an enthalpy change of = [tex]\frac{0.0208 * - 886}{5}\\\\[/tex] = –3.69 KJ.
Thus, the enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.
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What are the missing
coefficients?
_Fe + _Cl2 → _FeCl3
A substance has a sea level boiling point of 78°C. You take the substance about 3,000 meters up a mountain and heat it in a pot. What would be the most likely boiling point for this substance at that elevation: 68°C, 78°C, 95°C, or 100°C? Explain.
Answer:
68 °C.
Explanation:
Hello.
In this case, since the relationship between the altitude and the boiling point is inversely proportional due to fact that the higher the altitude the lower the atmospheric pressure and therefore the lower the boiling point (temperature) and the lower the altitude the higher the atmospheric pressure and therefore the higher the boiling point. This is supported by the fact that at lower atmospheric pressures, more liquid molecules are likely to become gas since a weaker force is holding them together in liquid state and the other way around.
Therefore, the most likely boiling point at 3,000 m up a mountain will be below 78 °C, it means 68 °C.
Best regards.
The most likely boiling point for this substance at an elevation of 3,000 meters up a mountain is: A. 68°C.
Given the following data:
Boiling point at sea level = 78°CAltitude = 3,000 metersTo determine the most likely boiling point for this substance at that elevation:
Boiling point can be defined as the temperature at which a physical matter changes phase or state, especially from liquid to gas.
The boiling point of a substance is inversely proportional to altitude due to the effect of atmospheric pressure.
This ultimately implies that, the higher the altitude, the lower the boiling point and the lower the altitude, the higher the boiling point.
In this context, the boiling point of a substance at higher altitude such as on a mountain is lower because there is less atmospheric pressure acting on its molecules.
Deductively, the most likely boiling point for this substance at an elevation of 3,000 meters up a mountain would be less than 78°C.
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What is most often the next step if scientific evidence is established that does not support an accepted theory?
Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.
Explanation: