Asked by aduma

a gaseous compound of carbon and hydrogen contains 80% carbon by mass, one dm3 of the compound at s.t.p weighing 1.35g. calculate

Answers

Answered by bobpursley
calculate what?

assume you have 100 grams.

then 80 grams is carbon, or 80/12 moles
and 20 grams is H, or 20/1 moles H

C=80/12=6.66 moles
H= 20

divide each by the lowest
C=1
H=3 empirical formula: CH3

Now, 22.4 liters has a mass of 1.35*22.4 = 30.24grams
divide that by the empirical mass
30.24/15=2
Molecular formula: twice the empirical formula, or C2H6

Your instructor is just too easy.
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