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.
JH
Related Chemistry GCSE answers
All answers ▸How does the structure of diamond influence its properties?
How can you distinguish between an endothermic reaction and an exothermic reaction based on temperature change of the surroundings.
Describe how and explain why vegetable oils are hardened for use in foods. [5 marks]
What is made when an acid is added to an alkali?