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The formula mass of ammonium sulphate is

[Given atomic masses: H= 1 u, N = 14 u, O = 16 u, S = 32 u]

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123 u

132 u

128 u

140 u

answer is B.

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Detailed Solution

The formula mass of ammonium sulphate is 132 u.
Ammonium sulphate, whose chemical formula

{({NH}_{4})}_{2} {SO}_{4}

is an inorganic salt that has several industrial applications. The most typical usage is as a fertiliser for the soil. It has 24% sulphur and 21% nitrogen. The formula mass of ammonium sulphate

{({NH}_{4})}_{2} {SO}_{4}

= Atomic mass of 2 nitrogen atoms + Atomic masses of 8 hydrogen atoms + Atomic mass of 1 sulphur atom + Atomic masses of 4 oxygen atoms

\Rightarrow

2 \times 14 + 8 \times 1 + 1 \times 32 + 4 \times 16

\Rightarrow

28 + 8 + 32 + 64

\Rightarrow

132 u
Thus, the formula mass of ammonium sulphate

{({N H}_{4})}_{2} S O_{4}

is 132 u.

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