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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 combinations will govern your answer?
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Solution
| C | + | O2 | → | CO2 |
| 3g | 8g | 11g |
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.
Furthermore, it reveals that carbon dioxide comprises carbon and oxygen in a fixed mass ratio of 3 : 8. Thus, it demonstrates the law of unchanging proportions. 3 g of carbon must combine with only 8 g of oxygen. This means that (50 - 8) = 42 g of oxygen will be unreacted.
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