Asked by Jimmy

Which hydrocarbon pair below have identical mass percentage of C?
A: C3H4 and C3H6
B: C2H4 and C3H4
C: C2H4 and C4H2
D: C2H4 and C3H6
E: None of the above

My answer is E...Can any one help me?
Answered by DrBob222
I think you are correct. To have the identical mass percentage of C the "other" compound must have a multiple of C with the same multiple of H and none of the answers qualify.
Answered by Ian
A trick to solving this type of problem is to reduce all of the ratios to either their simplest form or a percentage.

Ex. 3C/6H => 2C/4H => 1C/2H = 50% C

1/2 is the simplest form, and the molecule is 50% Carbon.

With this in mind, you should look over your options once more.
Answered by Sahar
all of above is wrong.
i have the same question for school.
Answered by Amanda
should be D: C2H4 and C3H6
both give you the ratio 1:2
Answered by DrBob222
Amanda is right.
C2H4. %C = 24/28 = 85.714%
C3H6. %C = 36/42 = 85.714%
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