Which of the following is the relative molecular mass of a compound which has empirical formula CH(_2)O? (H = 1; C = 12; O = 16)
-
A.
42 -
B.
45 -
C.
126 -
D.
180 -
E.
145
Correct Answer: Option D
Explanation
Empirical formula = CH(_2)O
= 12 + (2 x 1) + 16
= 30
Molecular formula = (CH(_2)O)(_n), where n is a whole number.
= 30n
(therefore) From the options, only 180 is a multiple of 30. Hence, that is the only likely molecular mass with respect to CH(_2)O.