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28/12/2020 12:23 pm
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When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.0 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.0 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer?
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28/12/2020 12:26 pm
C(3 g) + O2(8 g) → CO2(11 g)
Total mass of reactants = mass of C + mass of O2
= 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 (50 - 8) = 42 g of oxygen will remain un reacted.