Which hydrocarbon pair below have identical mass percentage of C? A) C₂H₄and C₄H₂ B) C₂H₄and C₃H₄ C) C₃H₄and C₃H₆ D) C₂H₄and C₃H₆ E) none of the above

Question

Quizplus · Accepted Answer

The mass percentage of carbon in a hydrocarbon can be calculated by dividing the mass of carbon in the molecule by the total mass of the molecule and multiplying by 100. CS1U1B12S1U1B0HS1U1B14 has 12 carbon atoms and a total mass of 338 (12x12+1x1+14x16), giving a mass percentage of 44.97%. CS1U1B13S1U1B0HS1U1B16S1U1B0 has 13 carbon atoms and a total mass of 384 (13x12+1x1+16x16), also giving a mass percentage of 44.97%. Therefore, option D is the correct choice.

Which Hydrocarbon Pair Below Have Identical Mass Percentage of C