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Answer :
When 3.0 g of carbon is burnt in 8.00 g of oxygen, 11.00 g of carbon dioxide is produced.
Thus carbon and oxygen are combined in the ratio of 3 : 8 to give 11g of carbon dioxide .
Hence for 3 g of carbon and 50 g of oxygen, 8 g of oxygen is used and 11g of carbon is formed while 42 g of oxygen is left unused. This chemical combination is governed by law of definite proportions.