# 20 liters of hydrogen reacts with carbon to find the mass of the reaction product if the yield is from

20 liters of hydrogen reacts with carbon to find the mass of the reaction product if the yield is from the theoretical possible 85%.

C + 2H2 = CH4

M (H2) = 2 g / mol.

M (CH4) = 16 g / mol.

Vm = 22.4 L / mol.

n (H2) = 20 / 22.4 = 0.89166 mol.

From the equation and stoichiometric coefficients, we see that the amount of hydrogen is twice the amount of methane.

Then:

n (CH4) = 0.89166 / 2 = 0.445 mol.

n = m / M => m = n * M,

m = 0.445 * 16 = 7.133 – theoretical yield (100%).

Then the practical yield ζ is 85% of 100%:

mpract = ζ * mtheor.

mpract = 0.85 * 7.133 = 6.03 g. One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.