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Question

Formula unit mass for (NH4)2SO4 is :

A
142 u
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B
129 u
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C
137 u
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D
132 u
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Solution

The correct option is D 132 u
Formula unit mass for (NH4)2SO4
=2×atomic mass of N+8×atomic mass of H+1×atomic mass of S
+4×atomic mass of O
=2×14+8×1+1×32+4×16
=28+8+32+64
=132 u.

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