Question

an organic compound contains 92.4%Carbon and 7.6 %hydrogen. if the molecular mass of compound is 78 gram mol -1 .find the molecular formula of compound​

Answer 1

Answer:

n = 6

Explanation:

Assuming it is a hydrocarbon.

carbon= 92.4 grams and hydrogen = 7.6 grams.

Moles of carbon= 92.4/12 = 7.7 moles

Moles of hydrogen= 7.6/1 = 7.6 moles

Finding the simple ratios, C = 7.7/7.6 = 1 ( approx)

Therefore empirical formula is CH.

n = molar mass/ molar mass of empirical formula

= 78/13

n= 6

Multiply ‘n’ to empirical formula, Therefore molecular formula is C6H6 ( benzene)

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