A compound has the formula $C{H_3}C{O_2}H$.
How should the relative molecular mass, ${M_r}$, of this compound be calculated?
1 )
12 + 1 + 16
2 )
3(12 + 1) + 2(12 + 16) + 1
3 )
(4 × 12) + (2 × 1) + 16
(2 × 12) + (4 × 1) + (2 × 16)
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