Question

What mass of calcium oxide be obtained by heating 5 moles of calcium carbonate?

Answer 1

Hey.

Here is your answer.

The balanced equation for the decomposition of calcium carbonate is as follows:
CaCO3 ---(heat)----> CaO + CO2
As 1 mole of Caclium carbonate on decomposition yields only 1 mole of CaO therefore, 
5 mole of CaCO3 will also form 5 mole of CaO.

We known, 
Number of moles = Mass/ Molar mass
Molar mass of CaO = 56.0 g per mole 
Mass of CaO = 56.0 x 5 
= 280g 
Hence, 280g of CaO will be obtained by the decomposition of 5 mol of CaCO3.

Thanks.