Question

Use the equation below to solve the problem that follows.

Answer 1

Percent yield = 70%

Further eplanation

Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

2H₂ (g) + O₂ (g) → 2H₂O (g)

• mass of H₂O (theoretical) :

$\tt mass=mol\times MW(mol~ratio~H_2O\div H_2=2\div 2)\\\\mass=(\dfrac{2}{2}\times \dfrac{13.8}{2})\times 18~g/mol\\\\mass=124.2~g$

• percent yield

$\tt \%yield=\dfrac{87}{124.2}\times 100\%=\boxed{\bold{70\%}}$