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WAEC Chemistry 2018 Paper

Question : 41

Total: 50

\mathrm{CH_2O}

? [C= 12, H= 1, O= 16]

Solution:

Concept:

The relative molecular mass is always a whole-number multiple of the empirical formula mass.

Explanation:

Empirical formula is

\mathrm{CH_2O}

Empirical formula mass

= 12 + (2 \times 1) + 16 = 30

Relative molecular mass

= 30 \times n

, where

n = 1,2,3,\dots

From the options,

30 \times 6 = 180

Hence, the correct relative molecular mass is 180.

Answer:

D. 180

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