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Which of the following is the relative molecular mass of a c...

Which of the following is the relative molecular mass of a compound which has empirical formula CH2O? (H = 1; C = 12; O = 16)

A.

42

B.

45

C.

126

D.

180

E.

145

View answer & explanation

Correct answer is D

Empirical formula = CH2O

= 12 + (2 x 1) + 16

= 30

Molecular formula = (CH2O)n, where n is a whole number.

= 30n

∴ From the options, only 180 is a multiple of 30. Hence, that is the only likely molecular mass with respect to CH_2O.

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