Question

If the empirical mass of the formula \[\mathrm{PQ_2}\] is 10 and the relative molecular mass is 30, then the molecular formula will be ______.

Options

• \[\mathrm{PQ_2}\]

• \[\mathrm{P_3Q_2}\]

• \[\mathrm{P_6Q_3}\]

• \[\mathrm{P_3Q_6}\]

Answer 1

If the empirical mass of the formula \[\mathrm{PQ_2}\] is 10 and the relative molecular mass is 30, then the molecular formula will be ______.

Explanation:

The multiplier is \[n=\frac{30}{10}=3\]. Multiplying every subscript in the empirical formula by 3 gives \[\mathrm{P_3Q_6}\].