Question

deduce the molecular formula of the alkene which has a relative molecular mass of 168. show your working.
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Answer 1

Answer:

let number of carbon = n

hence

12 n + 2n = 126

14n = 126

n = 9

hence alkene = C9 H18

Answer 2

The molecular formula of the alkene with relative molecular mass of 168 is; C12H24.

Empirical and Molecular formula.

The empirical formula of alkenes is;

• CH2.

Hence, it follows that the molecular formula of alkenes usually takes the form;

• (CH2)n.

Since the molar mass of Carbon, C = 12 and molar mass of Hydrogen, H = 1;

• (12 + 2)n = 168.

• n = 168/14

n = 12

Hence, the molecular formula of the alkene is; C12H24

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