A compound has an empirical formular CH2O and molecular mass of 90. [H = 1.00,…

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Chemistry WAEC 2015

A compound has an empirical formular CH2O and molecular mass of 90.

[H = 1.00, C = 12.0, O = 16.0]

  • C4H10O2
  • C3H10O2
  • C3H6O3 checkmark
  • C2H2O4

The correct answer is: C

Explanation

(CH2O)n = 90; (12 + (1 x 2) + 16)n = 90
(12 + 2 + 16)n = 90; 30n = 90; n = \(\frac{90}{30}\); n = 3
(CH2O)3 = Molecular formula ; = C3H6O3
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