Question

Why 42g of oxygen remains unreacted when it is burnt in 3g of carbon with 50g of oxygen....?????

Answer 1

when 3 gram of carbon is burnt in 8 gram of oxygen, then 11 gram of carbon dioxide gas gets produced.

if 3 gram of carbon is burnt in 50 gram of oxygen then also 11 gram of carbon dioxide will you get formed.

And rest of 42 gram of Oxygen will remain unreacted this shows the law of constant proportion. Carbon dioxide and oxygen always combine in ratio of 3:8 and rest remains unreacted.

That is why 50-8=42 gram of oxygen remains unreacted.

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Answer 2

It is simply because they react in a definite ratio. Carbon and oxygen react in the ration of 3:8 so 3g of carbon reacts with 8 g of oxygen while 42 g 【50-8】of oxygen remains unreacted.

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