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Question

When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced? What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer?

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Solution

C+O2CO2
3g 8g 11g
Total mass of reactants = mass of carbon + mass of oxygen =3+8=11g
Total mass of reactants = Total mass of products

Hence, the law of conservation of mass is proved.

Further, it also shows carbon dioxide contains carbon and oxygen in a fixed ratio by mass, which is 3:8.

Thus it also proves the law of constant proportions. 3 g of carbon must also combine with 8 g of oxygen only.
This means that (508)=42g of oxygen will remain unreacted.

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