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The formula mass of aluminium sulphate is:

[Given atomic masses: Al = 27 u, S = 32 u, O = 16 u ]

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342 u

330 u

340 u

348 u

answer is A.

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Detailed Solution

The formula mass of aluminium sulphate is 342 u.

A l_{2} (S O_{4})_{3}

is the chemical formula for aluminium sulphate. It is soluble in water and is primarily employed as a coagulant in the filtration of drinking water, the treatment of sewage, and the production of paper.
The formula mass of aluminium sulphate

A l_{2} (S O_{4})_{3}

= Atomic mass of 1 Al atom + Atomic masses of 3 sulphur atoms + Atomic masses of 12 oxygen atoms

\Rightarrow 2 \times 27 + 3 \times 32 + 12 \times 16

\Rightarrow 54 + 96 + 192

\Rightarrow

342 u
Thus, the formula mass of aluminium sulphate

(A l_{2} S O_{4})_{3}

is 342 u.

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