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WAEC Chemistry 2018 Paper

Question : 41

Total: 50

\mathrm{CH_2O}

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

Solution:

Molecular formula = (empirical formula x n)

where n= (1,2,3,...)

$\mathrm{CH_2O} = 12 + (2 \times 1) + 16 = 30$

Relative molecular mass = (30 x n)

From the options, only 180 is a multiple of 30, when n=6.

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