Calculate the mass of calcium oxide that can be obtained by burning Ca with O2 with a volume of 8.96 liters, if it is known

univerkov | December 9, 2020 | education

Calculate the mass of calcium oxide that can be obtained by burning Ca with O2 with a volume of 8.96 liters, if it is known that the mass fraction of CaO yield from the theoretically possible is 85%.

Decision :
2Са + О2 = 2СаО
n (O2) = V / Vm = 8.96 / 22.4 = 0.4 mol.
n (CaO) = 2n (O2) = 0.4 x 2 = 0.8 mol.
m (CaO) = M * n = 0.8 mol x 56 g / mol = 44.8 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.