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WAEC Chemistry 2018 Paper

Question : 29

Total: 50

Which of the following CANNOT be an empirical formula?

Solution:

Concept:

An empirical formula is the simplest whole-number ratio of atoms in a compound.

Explanation:

\mathrm{CH}

\mathrm{CH_2}

, and

\mathrm{P_2O_5}

are already in their simplest whole-number ratios.

They cannot be reduced further.

But

\mathrm{N_2O_4}

can be divided by 2 to give

\mathrm{NO_2}

\mathrm{N_2O_4}

is a molecular formula, not an empirical formula.

Answer:

\mathrm{N_2O_4}

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