Question

**When solid CaCO3 is heated, it decomposes to give solid
CaO and CO2 gas. A volume of 560 mL of gas is collected over water
at a total pressure of 730 mmHg and 16 ∘C. The vapor pressure of
water at 16 ∘C is 14 mmHg. CaCO3(s)→CaO(s)+CO2(g)**

1)How many moles of CO2 gas were in the CO2 gas sample? Express your answer with the appropriate units

Answer #1

Use ideal gas equation for calculation of mole of gas

Ideal gas equation

PV = nRT where, P = atm pressure= 730 - 14 = 716 mmHg = 0.9421 atm,

V = volume in Liter = 560 ml = 0.560 L

n = number of mole = ?

R = 0.08205L atm mol^{-1} K^{-1}
=Proportionality constant = gas constant,

T = Temperature in K = 16^{0}C = 273.15+ 16 = 289.15
K

We can write ideal gas equation

n = PV/RT

Substitute the value

n = (0.9421 X 0.560)/(0.08205X 289.15) = 0.0222 mole

**0.0222 mole of CO _{2} gas in sample**

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CaCO3(s) <----> CaO(s) + CO2(g)
Using the data below, calculate the equilibrium partial pressure of
CO2(g) over a mixture of solid CaO and CaCO3 at 500 ◦C if ∆CP,m for
the reaction is independent of temperature over the temperature
range between 25 ◦C and 500 ◦C
...............................CaO(s)..........CO2(g)..............
CaCO3(s)
∆H◦ f (kJ/mol) .......−635.09 ......−393.51
............−1206.92
S◦ m (J / mol K) ......39.75 .........213.74
.................92.90
CP,m (J /...

When heated, calcium carbonate decomposes to yield calcium oxide
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CaCO3(s)→CaO(s)+CO2(g)
What is the mass of calcium carbonate needed to produce 77.0 L
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Express your answer with the appropriate units.

A solid sample consisting of 0.5 kg CaCO3 (s) was heated to 835
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The heating carried out in a container fitted with a piston that
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± Stoichiometric Relationships with Gases
The ideal gas law
PV=nRT
relates pressure P, volume V, temperature
T, and number of moles of a gas, n. The gas
constant Requals 0.08206 L⋅atm/(K⋅mol) or 8.3145
J/(K⋅mol). The equation can be rearranged as follows to solve for
n:
n=PVRT
This equation is useful when dealing with gaseous reactions because
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1.Calculate the mass of CaCO3 that would produce ~
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Hint use molar volume of an ideal gas (22.4 L).
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true
false

The ideal gas law
PV=nRT
relates pressure P, volume V, temperature
T, and number of moles of a gas, n. The gas
constant Requals 0.08206 L⋅atm/(K⋅mol) or 8.3145
J/(K⋅mol). The equation can be rearranged as follows to solve for
n:
n=PVRT
This equation is useful when dealing with gaseous reactions
because stoichiometric calculations involve mole ratios.
A)When heated, calcium carbonate decomposes to yield calcium
oxide and carbon dioxide gas via the reaction
CaCO3(s)→CaO(s)+CO2(g)
What is the mass of calcium carbonate...

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