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0.30 g of a substance gives 0.88 g of ca...

0.30 g of a substance gives 0.88 g of carbon dioxide and 0.54 g water. Calculate the percentage of carbon and hydrogen in it.

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Weight of organic compound = 0.30 g
Weight of carbon dioxide = 0.88 g
Weight of water = 0.54 g
Percentage of carbon
44 g of carbondioxide contains, carbon = 12 g
`"0.88 g of carbon dioxide contains, carbon"=(12xx0.88)/(44)g`
`"0.30 g substance contains, carbon"=(12xx0.88)/(44)g`
`"100 g substance contains"`
`=(12xx0.88)/(44)xx(100)/(0.30)="80 g of carbon"`
Percentage of carbon = 80
Percentage of hydrogen
18 g of water contains, hydrogen `=2g`
`"0.54 g of water contains, hydrogen"=(2xx0.54)/(18)g`
`"0.30 g of substance contains hydrogen"=(2xx0.54)/(18xx0.30)g`
`"100 g of substance contains"=(2xx0.54)/(18xx0.30)xx100g`
= 20 g of hydrogen
Percentage of hydrogen = 20
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  • 0.36g of an organic compound on combustion gave 1.1g of CO_2 and 0.54g of H_2O . The percentages of carbon and Hydrogen in the compound are

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