STICHIOMETRY REACTION

Question

For the following reaction, 5.75 grams of hydrogen gas are mixed with excess ethylene (C₂H₄) . The reaction yields 59.0 grams of ethane (C₂H₆) .

hydrogen ( g ) + ethylene (C₂H₄) ( g )  ethane (C₂H₆) ( g )

What is the theoretical yield of ethane (C2H6) ?
What is the percent yield for this reaction ?

Answer 1

H₂(g) + C₂H₄(g) ==> C₂H₆ (g) ... balanced equation

Theoretical yield:

5.75 g H₂ x 1 mol H₂/2.02 g x 1 mol C₂H₆/mol H₂ x 30.1 g C₂H₆/mol C₂H₆ = 85.7 g C₂H₆ (theoretical)

% yield = actual yield/theoretical yield (x100%) = 59.0 g/85.7 g (x100%) = 68.8% yield