Calculate the molecular masses of the following compounds:
(a) Methanol $C H_{3} O H$
(b) Ethanol, $C_{2} H_{5} O H$

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Solution

(a) Molecular mas of methanol $(C H_{3} O H) = (1 \times C) + (3 \times H) + (1 \times O) + (1 \times H) = 12 + (3 \times 1) + 16 + 1 = 32 u$

(b) Molecular mass of ethanol $(C_{2} H_{5} O H) = (2 \times C) + (5 \times H) + (1 \times O) + (1 \times H) = (2 \times 12) + (5 \times 1) + 16 + 1 = 46 u$

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Calculate the difference in the formulae and molecular masses for :

(a) $C H_{3} O H$ and $C_{2} H_{5} O H$

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