Calculate the molar mass of the following substances.
$(a)$ Ethyne, $C_{2} H_{2}$
$(b)$ Sulphur molecule, $S_{8}$
$(c)$ Phosphorus molecule, $P_{4}$ (Atomic mass of phosporus $= 31$ )
$(d)$ Hydrochloric acid, $H C l$
$(e)$ Nitric acid, $H N O_{3}$

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Solution

(a) Ethyne ( $C_{2} H_{2}$ ) = $2 \times M a s s o f C a t o m + 2 \times M a s s o f H a t o m = 2 \times 12 + 2 \times 1 = 24 + 2 = 26 g / m o l$

(b) Sulphur dioxide ( $S_{8}$ )= $8 \times M a s s o f s u l p h u r a t o m = 8 \times 32 = 256 g / m o l$

(c) $P_{4} = 4 \times M a s s o f P a t o m = 4 \times 31 = 124 g / m o l$

(d) $H C l = 1 \times M a s s o f H a t o m + 1 \times M a s s o f C l a t o m = 1 + 35.5 = 36.5 g / m o l$

(e) $H N O_{3} = 1 \times M a s s o f H a t o m + 1 \times M a s s o f N a t o m + 3 \times M a s s o f O a t o m$
$= 1 \times 1 + 1 \times 14 + 3 \times 16 = 63 g / m o l$

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