Question

The volume of CO2 producad at STP on heating 25g of CaCO3

Answer 1

moles of CaCO3 - 25/100 - 1/4

CaCO3- CaO + CO2

moles of CaCO3 = moles of CO2=1/4

volume formed of CO2=1/4*22.4=22.4/4=5.6

So volume of CO2 formed at STP is 5.6 litres.