Which of the following hydrocarbons contains the greatest percent by mass of carbon? Group of answer choices

C3H4 (propyne)

CH4 (methane)

C2H4 (ethene)

C2H2 (acetylene)

C₂H₂ has  the greatest percent by mass of carbon (92.3%)

Given

Hydrocarbons

Required

The greatest percent by mass of Carbon

Solution

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a constant composition of elements

% A in AxBy = (x.Ar A/MW AxBy) x 100%

C₃H₄ = 3.12/40 x 100%=90%

CH₄ = 12/16 x 100% = 75%

C₂H₄=2.12/28 x 100% = 85.7%

C₂H₂=2.12/26 x 100% = 92.3%

16

explanation:

the marks go by 4s

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