Question

4.4grams of a hydrocarbon on combustion produced 6.72litres of carbon dioxide at STP and sufficient water vapour that can be generate 0.4grams of hydrogen with exess Sodium. The hydro carbon is X times heavier than carbon dioxide. what is X?
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Answer 1

Answer:

A hydrocarbon is a compound which consists of carbon and hydrogen only. It undergoes combustion forming carbon dioxide and water as products. 

Formula of carbon dioxide =CO2;

Molecular mass =12+32=44g 

Formula of water =H2O; 

Molecular mass =2+16=18g 

Mass of carbon in 0.88 g of CO24412×0.88=0.24g 

Mass of hydrogen in 1.8 g of H2O=!82×1.8=0.20g

Total masses of carbon and hydrogen in the products =0.24+0.20=0.44g 

This is equal to the mass of hydrocarbon before combustion. Thus, the results are in accordance with the law of conservation of mass.