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The relative formula mass of CaO is 56 and the relative formula mass of CO2 is 44. What is the mass of CaO that can be obtained from 200 g of CaCO3. CaO3 -> CaO + CO2

We are given the relative formula mass (RFM) of CaO and CO2, we should therefore calculate the RFM of CaO3:

RFM of CaCO3 = 40 + 12 + (16 x 3) = 100

If we look at the reaction in the question, we can see one CaCO3 goes to one CaO and one CO2.

Effectively, in 200 g we have 2 lots of CaCO3, therefore we can make 2 lots of CaO and two lots of CO2.

Therefore we can make 2 x 56 g = 112 g of CaO from 200g of CaCO3.

Joshua H. GCSE Chemistry tutor, A Level Chemistry tutor, IB Chemistry...

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