First slide
Stoichiometry and Stoichiometric Calculations
Question

20 ml of ethyne requires …… ml of air at STP for complete combustion. 

Moderate
Solution

C2H2g + 52O2g  2CO2g + H2Ol ; 20ml          50ml           Volume of oxygen required=50ml; Air contains 21% by volume of oxygen ; Volume of air required=10021×50=238 ml ;

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