Answer to Question #134760 in Chemistry for rashin

Question

What mass of calcium oxide, CaO, forms when 28g calcium carbonate, CaCO3, decomposes on heating?

Answer 1

CaCO₃ = CaO+CO₂

n (CaO)=n(CaCO₃)

n=m/M

M(CaCO₃)=100 g/mol

M(CaO)=56 g/mol

n(CaCO₃)=28/100=0.28 mol

n (CaO)=n(CaCO₃)=0.28 mol

m (CaO)=n x M = 0.28 x 56 = 15.7 g