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Q)

What is the percentage of carbon , hydrogen and oxygen in ethanol ?

$(a)\;75.76\% \\ (b)\;25\% \\(c)\;34.73\% \\(d)\;50\% $

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A)
Solution :
Molecular formula of ethanol is $C_2H_5OH$
Molar mass of ethanol is :$(212.01+61.008+16.00)\;g=46,068$
Molar percent of carbon is =$(24.02\;g/46.068\;g) \times 100=52.14\%$
oxygen $=(1600.g/46.068\;g)\times 100=34.73\%$
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