Formula unit mass for $(N H_{4})_{2} S O_{4}$ is :

142 u

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129 u

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137 u

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132 u

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Solution

The correct option is D 132 u
Formula unit mass for $(N H_{4})_{2} S O_{4}$
$= 2 \times a t o m i c m a s s o f N + 8 \times a t o m i c m a s s o f H + 1 \times a t o m i c m a s s o f S$
$+ 4 \times a t o m i c m a s s o f O$
$= 2 \times 14 + 8 \times 1 + 1 \times 32 + 4 \times 16$
$= 28 + 8 + 32 + 64$
$= 132 u$ .

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