Chemistry Practice Problems Gas Stoichiometry Practice Problems Solution: The ideal gas law PV = nRT relates pressure P, vol...

Solution: The ideal gas law PV = nRT relates pressure P, volume V, temperature T, and number of moles of a gas, n. The gas constant R equals 0.08208 L middot atm/(K • mol) or 8.3145 J/(K • mol). The equation can be rearranged as follows to for n: n = PV/RT This equation is useful when dealing with gaseous because calculations involve mole ratios. Part AWhen heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3  → CaO + CO2  What is the mass of calcium carbonate needed to produce 63.0 L of carbon dioxide at STP? Express your answer with the appropriate units.

Problem

The ideal gas law 

PV = nRT 

relates pressure P, volume V, temperature T, and number of moles of a gas, n. The gas constant R equals 0.08208 L middot atm/(K • mol) or 8.3145 J/(K • mol). The equation can be rearranged as follows to for n: 

n = PV/RT 

This equation is useful when dealing with gaseous because calculations involve mole ratios. 

Part A

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction 

CaCO3  → CaO + CO2  

What is the mass of calcium carbonate needed to produce 63.0 L of carbon dioxide at STP? 

Express your answer with the appropriate units.

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