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September 18, 2014

Homework Help: IGCSE Chemistry

Posted by Amir on Sunday, December 25, 2011 at 7:21am.

Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively.
a) Which elements does a hydrocarbon contain?
b) Calculate the empirical formula of A and of B.
c) Calculate the molecular formula of A and B.


I solved a) and b)

the solutions are
a) Hydrogen and Carbon
b) the simplest ratio is 2:1 so empiral formula is CH2

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