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WAEC Chemistry 2018 Paper

Question : 35

Total: 50

Solution:

Concept:

The empirical formula is the simplest whole-number mole ratio of elements in a compound.

Explanation:

Moles of Cu

= 0.067

mol

Moles of O

= 0.066

mol

Divide each mole value by the smallest mole value, which is

0.066

Cu:

\frac{0.067}{0.066} \approx 1

\frac{0.066}{0.066} = 1

So the mole ratio of Cu to O is

1 : 1

Therefore, the empirical formula is

\mathrm{CuO}

Answer:

\mathrm{CuO}

— Option B.

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