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JAMB Chemistry 2024 Paper

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Question : 41

Total: 138

The molecular formular of a hydrocarbon with an empirical formula of CH

_3

and a molar mass of 30 is

C $_2$ H $_4$
C $_3$ H $_3$
C $_2$ H $_6$
C $_6$ H $_6$

Solution:

Empirical formula x n = Molecular mass

(CH $_3$ ) X n = 30 ; Given that C = 12, H = 1

[ 12 + (1x3) ] n = 30

15n = 30

n = $\; \frac{30}{15}$

n = 2.

Molecular formula = (CH $_3$ ) X n = (CH $_3$ ) X 2 = C $_2$ H $_6$

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