Problem: Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)1,3-ButadieneC4 H6 (g)111.91-ButeneC4 H8 (g)1.2n-ButaneC4 H10 (g)-124.7For 1,3-Butadien determine the percentage of hydrogen by mass.

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We are asked to determine the percentage of hydrogen by mass for 1,3-Butadiene. 


Molar mass C4H6 = 54.06 g/mol

Molar mass H = 1.01 g/mol


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Problem Details
Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:


HydrocarbonFormulaHf(kJ/mol)
1,3-ButadieneC4 H6 (g)111.9
1-ButeneC4 H8 (g)1.2
n-ButaneC4 H10 (g)-124.7


For 1,3-Butadien determine the percentage of hydrogen by mass.

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