Question

A compound contains 80% carbon and 20% hydrogen. What is the empirical formula of compound ?

Answer 1

Answer:

empirical formula = CH3

Explanation:

Element NO. of moles Simple ratio

C80% 80/12 =6.66 1

H20% 20/1=20 3

empirical formula = CH3

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Answer 2

Answer:

Moles of carbon=80g/12.011g mol= 6.66 mol

and,thus

moles of hydrogen=20g/1.008g mol=19.8g

we,divide the molar quantities

through the SMALLER quantity

C: 6.66mol/6.66mole=1

H: 19.8mol/ 6.66mol=2.97

so,

the empirical formula=CH3