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Question

Calcium carbonate decomposes upon heating, producing calcium oxide and carbon dioxide gas.

a. Write a balanced chemical equation for this reaction.

b. How many grams of calcium oxide will remain after 12.25 g of calcium carbonate is completely decomposed?

i know how to do part A and B but not C. For part C you need to use the ideal gas law and rearrange it to V = nRT/P

Thx for the help on part C

Answer 1

CaCO3 --> CO2 + CaO

1 mole of CaCO3 produces 1 mole of CaO and 1 mole of CO2

12.25 g CaCO3 / 100.09 g/mol = 0.1224 mol CaCO3

CaO: 0.1224 mol x 56.08 g/mol = 6.864 g CaO

V=nRT/P

V = 0.1224 mol x 0.08206 x 283 K / 0.95 atm = 2.99 liters CO2

Answer 2

so for c you first have to find out what the molarity of carbon dioxide you would get from the same reaction in part b.  then you do v=(CO2 molarity)x(R in terms of atm and Kelvin)x(10+273)/.95 atm