How do you calculate a molecular formula given a compound's molar mass and empirical formula?
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Answer:
I'll just show an example. Say you know the empirical formula is CH2O and the molar mass is 180 g/mol. We know the molecular formula is Cx H 2x O x. So we can write down an equation expressing the molar mass as a function of x: 12 * x + 1.01 * 2x + 16 * x = 180 --> x = 6 --> C6H12O6
Sean Ridout at Quora Visit the source
Other answers
Molar mass of the compound = n x empirical massYou can find out the empirical mass by adding up the mass of the individual elements in the empirical formula. e.g., if C2H4 is the empirical formula then the empirical mass is 2(12) + 4(1) = 30.If you multiply n with the empirical formula, you will get the molecular formula.
Arpit Shukla
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