A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
How can we determine the acidity or basicity of a solution?If pH < 7, the solution is acid.If pH = 7, the solution is neutral.If pH > 7, the solution is basic.Step 1. Calculate the pOH of the solution.The hydroxide ion concentration is 2.5 × 10⁻⁴ mol/L.
pOH = -log [OH⁻] = log (2.5 × 10⁻⁴) = 3.6
Step 2. Calculate the pH of the solution.We will use the following expression.
pH + pOH = 14
pH = 14 - pOH = 14 - 3.6 = 10.4
Since pH > 7, the solution is basic.
A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
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A 0.30 M solution of formic acid, HCHO 2, is 2.4% ionized. The ionization constant for formic acid is O a. 1.7 X 10-4 O b.7.2 x 10-3 O C.24 X 10-2 O d. 1.6 X 10-5
Answer:
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H₂O Is water but what type?
Answer: H₂O is just water
Explanation:
Answer:
h2o is a water which is a clear, colorless, odorless, tasteless liquid that freezes into ice below 0°C and boils above 100°C.
d. How many molecules of CO2 are produced from 62.4 g
of C10H18
The number of molecules of CO₂ produced from 62.4 g of C₁₀H₁₈ is equal to 27.099×10²³.
What is Avogadro's number?Avogadro's number is define as the number of entities present in one mole of any susbtance and it willl be equal to 6.022×10²³.
Moles (n) from mass will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction will be represented as:
C₁₀H₁₈ + 29/2O₂ → 10CO₂ + 9H₂O
Moles of C₁₀H₁₈ = 62.4g / 138.25g/mol = 0.45 moles
From the stoichiometry of the reaction,
0.45 mole of C₁₀H₁₈ = produces 10×0.45 = 4.5 moles of CO₂
By using the avogadro's formula, molecules of CO₂ will be calculated as:
Molecules of CO₂ in 4.5mol = 4.5 × (6.022×10²³) = 27.099×10²³
Hence required molecules of CO₂ is 27.099×10²³.
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A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the
total pressure is 1.24 atm. What is the partial pressure of hydrogen? Must show work! Use P^a/P^t = n^a/n^t
Answer:
i let alone need more time to figure this out and i will get you the awnser.
Explanation:
What units are carbon emissions measured in?
Answer:
GHG emissions are often measured in carbon dioxide (CO2) equivalent. To convert emissions of a gas into CO2 equivalent, its emissions are multiplied by the gas's Global Warming Potential (GWP).
What is the formula of this
inorganic salt hydrate?
Salt hydrates are an important class of PCMs. An inorganic salt hydrate (hydrated salt or hydrate) is an ionic compound in which the ions attract a number of water molecules, which are then trapped inside the crystal lattice. A hydrated salt has the generic formula MxNy. nH2O.
Which is NOT a disadvantage of using electromagnetism?
A.) cause cancer
B.) damage medical equipment
C.) accurate viewing of soft tissue in the body
D.) heat up quickly
Answer:
Electromagnetism can cause cancer
So option A is incorrect
Electromagnetism can damage a medical instruments
It is also a disadvantage and this option is not correct
Now come to C it says that electromagnetic is used to veiw the soft tissue it is not a disadvantage but a advantage so C IS THE CORRECT ANSWER
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
Your mom buys you a helium balloon at the circus. It has a volume of 4.00 liters at STP. What mass of helium (He), expressed in grams, does this balloon contain?
Answer:
2.8 g
Explanation:im not 100%
According to ideal gas equation and STP conditions, mass of helium is 7.04×10[tex]^-2[/tex] g.
What is ideal gas equation?The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.The law has been proposed by Paul Emile Clapeyron, a physicist and an engineer in 1834.The law is applicable to only ideal gases at all temperature and pressure.
In the given problem, pressure= 1 atmosphere , volume=4 liters, molar mass= 4 g/mole ,R=8.314 , T= 273 K.
mass= PV×molar mass/RT=1×4×4/8.314×273=16/2269.722=7.04×10[tex]^-2[/tex] g.
Thus, the mass of helium gas is 7.04×10[tex]^-2[/tex] g.
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When magnesium is added to hydrochloric acid it reacts violently. If 87.0g of magnesium is used during this reaction how much magnesium chloride is produced?
Answer:
Magnesium hydroxide is a base. Hydrochloric acid, as the name suggests, is an acid.
So an acid and a base together will produce salt and water. In this case, the salt is magnesium chloride.
This process is known as neutralisation
Calculate the mass, in grams, of 532.0 atoms of cadmium, (1 mol of Cd has a mass of 112.41g)
Bonding with intermolecular forces:
1.) is CH3OH a hydrogen bonding? yes or no?
2.) is CH3OH dipole-dipole interactions? Yes or no?
3.) is CH3OH a london dispersion forces? Yes or no?
Answer:
its Methanol
Explanation:
1). Yes, CH3OH can form bonds (hydrogen bonds) with other CH3OH molecules.
2).Yes
3).Yes, it is a type of interaction created between non polar molecules.
23) A common reaction that occurs in cells is shown here. In the presence of oxygen, a glucose molecule is combusted to form carbon dioxide and water. If 360 grams of glucose are combusted fully,
calculate how many moles of oxygen gas will be needed to achieve this reaction.
A) 2
B) 8
C)12
D) 18
Answer:
C
Explanation:
add them together and multiply by 2
What is the standard enthalpy change for the reaction:
3NO2(g)+H2O(l)→2HNO3(aq)+NO(g)
Use standard enthalpies of formation in your textbook.
Select one:
a.
-66.2 kJ
b.
-138 kJ
c.
-116 kJ
d.
-201 kJ
A constant volume of oxygen is heated from 100oC to 185 oC. The initial pressure is 4.1 atm. What is the final pressure?
A constant volume of oxygen has a pressure of 4.1 atm at 100 °C and 5.0 atm at 185 °C according to Gay-Lussac's law.
What does Gay-Lussac's law state?At constant volume, the pressure of an ideal gas is proportional to its absolute temperature.
Step 1: Convert the temperatures to the absolute scale.We will do so by adding 273.15 to the Celsius temperature.
T₁: 100 °C + 273.15 = 373 K
T₂: 185 °C + 273.15 = 458 K
Step 2: Calculate the final pressure of the gas.We will apply Gay-Lussac's law.
P₁/T₁ = P₂/T₂
P₂ = P₁ × T₂/T₁
P₂ = 4.1 atm × 458 K/373 K = 5.0 atm
A constant volume of oxygen has a pressure of 4.1 atm at 100 °C and 5.0 atm at 185 °C according to Gay-Lussac's law.
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Which best describes the law
of conservation of mass?
• The coefficients in front of the chemicals in
the reactants should be based on the physical state of the products.
O Products in the form of gases are not considered a part of the total mass change from reactants to products.
• When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not.
• The mass of the reactants and products is
equal and is not dependent on the physical state of the
substances.
Mark this and retum
Save and Exit
Next
Submit
Answer:
The mass of the reactants and products is
equal and is not dependent on the physical state of the
substances.
1) Sodium hydroxide is deliquescent. A sample of 3.0 g was dissolved in 100 mL; 10 mL was titrated with 34.9 mL HCl 0.2 M. What is the percent of absorbed water in the sample?
From the calculation, the percentage of water in the sodium hydroxide sample is 7%.
What is neutralization?The term neutralization has to do with the reaction between an acid and a base to yiled salt and water.
Now we have to apply the titration formula;
CAVA/CBVB = NA/NB
CA = concentration of acid
CB = concentration of base
VA = volume of acid
VB = volume of base
NA = number of moles of acid
NB = number of moles of base
The reaction equation is; HCl + NaOH ----->NaCl + H2O
CAVANB = CBVBNA
CB = CAVANB /VBNA
CB = 34.9 * 0.2 M * 1/10 * 1
CB = 0.698 M
Number of moles = Conncentration * volume
= 0.698 M * 100/1000 L = 0.0698 moles
Mass = Number of moles * molar mass
Mass = 0.0698 moles * 40 g/mol = 2.79 g
percent of NaOH = 2.79 g/ 3g * 100/1 = 93%
Percent of water = 100- 93 = 7%
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Consider these reactions:
Reaction 1: H2(g) + Cla (g)
2HC1(g) AH = -184.6 kJ
Reaction 2: 20F2(g)
02(g) + 2 F2(g)
AH = -49.4 kJ
Reaction 3: N2(g) + 202(g)
2N02(g)
AH = +66.4 kJ
Use Reaction 1.
Determine the mass, in grams, of chlorine gas consumed (with excess H-) when
1,342.0 kJ of energy iS released from the system.
Answer: g
511.2 grams of chlorine gas consumed (with excess H-) when
1,342.0 kJ of energy is released from the system.
What is an exothermic reaction?In thermochemistry, an exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative."
Given that 1 mole of chlorine releases -184.6 energy.
Then, we have to find the number of moles of chlorine when 1,342.0 kJ of energy is released from the system.
So, calculating number of moles of chlorine.
Moles = [tex]\frac{-1,342.0 \;kJ}{-184.6\;kJ}[/tex]
Moles = 7.2 mole
Now, calculating number mass of chlorine.
[tex]\rm Moles=\rm\frac{Mass}{Molar \;mass}[/tex]
Mass = 7.2 mole x 71 g/mole
Mass = 511.2 gram
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The specific heat of water is 1.0 calorie/ gram °C. The amount of heat energy needed to raise the temperature of 450 grams of water from 25 °C to 55 °C is: O 15 calories
Answer:
Explanation:
We can use the equation to find out
E = mc△T
E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.
Substitute the numbers given
E = 500 x 1 x 10
E =5000
Therefore the answer is 5000CalWe can use the equation to find out
E = mc△T
E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.
Substitute the numbers given
E = 500 x 1 x 10
E =5000
Therefore the answer is 5000Cal
APP
Questions
Show all calculations and proper units to earn full marks
1.
Determine the identity of element X in the following nuclear reaction
atomic mass
a) 23°U → He + x
9202 atomic num
b) x
He + 282Pb
206
23go
c)
244 Cm + He
He
&X + 1H + 2an
96
d)
-
23U + x
BU
→ 2450f + 4 ón
Cf
98
10
257Lr + 5 on
+ 1.B →
el ?x
->
103
Answer:
Explanation:
This question is about nuclear reactions. (a) (i) Define the term unified atomic mass unit. [1]. 1/12th mass of an atom of carbon-12.
The nuclear reaction can be written as: Mg2512+He42→H11+XAZ. where. A is the mass number and; Z is the atomic number of the new nuclide, X.
The mass defect for an isotope was found to be 0.410 amu/atom. Calculate the binding energy in kJ/mol of atoms. (1 J = 1 kg m2/s2): (a) 3.69 x 1010
is Al+CuCl2 a spontaneous reaction?
Answer:
No, it isn't a spontaneous reaction.
Explanation:
A spontaneous reaction is a reaction that requires no outside intervention to start.
All chemical reactions require energy.
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Joel reacted 0.9845 g of iron filings with an excess of copper sulphate solution. When the reaction was complete the solution had changed from blue to green and a copper deposit weighing 1.024 g had formed in the solution. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2+) is converted into metallic copper.
a) Calculate the number of moles of iron used and the number of moles of copper
formed.
b) Calculate the theoretical mass of copper that was expected to be produced and
hence deter,mine the percentage yield of Joel’s experiment.
c) How many molecules of iron are present in 0.9845 g of iron fillings?
Fiona prepared a solution by dissolving 1.35 g of silver nitrate in a 250 mL volumetric flask and diluting it up to the volume.
d) Calculate the molarity of the silver nitrate solution.
e) What volume of this solution is required to prepare 100 mL of 0.01 M of silver nitrate solution?
From the stoichiometry of the reaction, the percentage yiled of the copper is 89.6%
What is reaction equation?The reaction equation here is given as; Fe(s) + CuSO4 (aq) ----->FeSO4(aq) + Cu(s)
Number of moles of Fe = 0.9845 g/56 g/mol = 0.018 moles. Since the reaction is 1:1, this is also the number of moles of Cu formed.
Theoretical yiled of Cu = 0.018 moles * 63.5 g/mol = 1.143 g
Percentage yiled = 1.024 g/1.143 g * 100/1 = 89.6%
If 1 mole of Fe contains 6.02 * 10^23 molecules
0.018 moles of Fe contains 0.018 moles * 6.02 * 10^23 molecules/1 mole = 1.1 * 10^22 molecules.
Number of moles of AgNO3 = 1.35 g/170 g/mol = 0.0079 moles
Molarity of the solution = 0.0079 moles/250 * 10^-3 L = 0.0032 M
Hence; 0.0032 M * V1 = 100 mL * 0.01 M
V1 = 312.5 mL
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what as the cause of wrld war 2?
Answer:
because peoples don't has so mu thinking power that time[tex]\bold{Heya!}[/tex]
Wowie- nice cat... plus, he or she is fluffy...
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[tex]\underline{Answer :}[/tex]
XxVioletXx
7. In the process of assembling bicycles, you have 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handlebars. Which is the limiting reactant in this process?
a. frames
c. seats
e. handlebars
b. tires
d. pedals
In the bicycle assembling process, the limiting reactant is seats since they will be used up first.
What is a limiting reactant?A limiting reactant is a reactant which is used up first in a reaction and on which product formation depends on.
In a given reaction, once the limiting reactant is used up, the reaction will stop.
For a bicycle to be assembled, 1 frame, 1 seat, 1 seat of handlebars, 1 seat of pedals and 2 tires are required.
In the process of assembling bicycles, there are 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handlebars.
Therefore, the limiting reactant is seats since they will be used up first.
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which molecule has zero polarity
Answer:
Carbon dioxide
Explanation:
The oxygen atoms are more electronegative than the carbon atom, so there are two individual dipoles pointing outward from the C atom to each O atom. However, since the dipoles are of equal strength and are oriented this way, they cancel out and the overall molecular polarity of CO 2 is zero.
Answer:
CO2 has zero polarity
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How much heat does your body lose when 6.35 g of sweat evaporates from your skin at 25 ∘C ? (Assume that the sweat is only water.) The heat of vaporization of water at 25 ∘C is 44.0 kJ/mol .
Answer:
15.52 kj
Explanation:
H2 O mole wt ~ 18 gm
6.35 gm is 6.35 gm /18 gm/mole = .353 moles of H2O
.353 moles * 44 kj/mole =
What is the molar mass of K₂CO₃?
Answer:
138g/mol
Explanation:
K₂CO₃ is also known as potassium carbonate. It has a molar mass of around 138.21 g/mol (138.2055 g/mol to be exact).
A chamber contains equal molar amounts of CO, CO2, N2, and O2. If the total chamber pressure is 3.00 atm, then the partial pressure of CO2 is
Answer:
[tex]P_{CO_2} = 0.75 atm[/tex]
Explanation:
[tex]P_{total} = P_{CO} + P_{CO_2} + P_{N_2} + P_{O_2}[/tex]
Since there's equal molar amounts we can conclude that
[tex]P_{CO_2} = P_{CO} = P_{N_2} = P_{O_2}[/tex]
So,
[tex]P_{total} = 4P_{CO_2}\\3.00 atm = 4P_{CO_2}\\P_{CO_2} = \frac{3.00 atm}{4} = 0.75 atm[/tex]
What is the phase of water at 1.0 atm and 50°C?
Water
(liquid)
Water vapor
(gas)
100
Temperature (°C)
Pressure (atm)
1-
0.5-
0.25-
0
Ice
(solid)
-10
OA. Liquid and gas
OB. Liquid
OC. Solid
D. Gas
0-
0.01
The given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.
What is phase of water?
Water can exist in three different phases, namely;
Liquid phase - usually between 0 to 100 degrees CelsiusSolid phase - below 0 degrees CelsiusVapor phase or gaseous phase - usually above 100 degrees CelsiusTherefore, if the given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.
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(image attached) AP CHEM ACID BASE Is my answer correct? I will mark as brainliest if you answer me. I don't need an explanation if i'm right just explain if i'm wrong. Thanks
Answer:
Your answer is correct based on what I remember from AP Chemistry
Explanation:
Question 5 of 5
Which term refers to the average kinetic energy of the particles in a sample of
matter?
OA. Temperature
OB. Potential energy
OC. Heat
OD. Thermal energy
SUBMIT.
Can you pls anwser as soon as u can
Answer:
Tempreture should be the correct answer!!
Explanation:
hope this helps ya!!