The hydrocarbon (X) with molar mass 80 g and 90% carbon has _____ degree of unsaturation. [2025]

Question

The hydrocarbon (X) with molar mass 80 g ${mol}^{- 1}$ and 90% carbon has _____ degree of unsaturation. [2025]

Smart Achievers · Accepted Answer

(3)

Mass of carbon in 80 g (i.e. 1 mol) hydrocarbon

$= \frac{90}{100} \times 80 g = 72$ g

Moles of C in 72 g (i.e. 1 mol) $= \frac{72}{12} mol = 6 mol$

Mass of H in 80 g (i.e. 1 mol) hydrocarbon $= (80 - 72) g = 8$ g

Moles of H in 80 g (i.e. 1 mol) hydrocarbon $= \frac{8}{1} mol = 8$ mol

So molecular formula is $C_{6} H_{8}$ i.e. degree of unsaturation = 3.

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