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Question

What is the molecular mass of sulphur dioxide (SO2)?

A
16 u
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B
48 u
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C
32 u
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D
64 u
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Solution

The correct option is D 64 u
Molecular mass of a substance is the sum of the atomic masses of its constituent atoms.
Molecular mass of (SO2)
= Atomic mass of S + [2 x (Atomic mass of O)]
= 32 + (2 x 16)
= 64 u.

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