As a result of the reaction of calcium and oxygen, some calcium oxide was formed.

As a result of the reaction of calcium and oxygen, some calcium oxide was formed. Calculate the amount and mass of oxygen and calcium oxide, if 80 g of calcium entered the reaction.

Given:
m (CaO) = 80 g
To find:
n (CaO)
n (O2)
m (CaO)
m (O2)
Decision:
2Ca + O2 = 2CaO
n (Ca) = m / M = 80 g / 40 g = 2 mol
n (Ca): n (CaO) = 1: 1
n (CaO) = 2 mol
m (CaO) = n * M = 2 mol * 56 g / mol = 112 g
n (Ca): n (O2) = 2: 1
n (O2) = 2 mol / 2 = 1 mol
m (O2) = n * M = 1 mol * 32 g / mol = 32 g
Answer: n (CaO) = 2 mol; m (CaO) = 112 g; n (O2) = 1 mol; m (O2) = 32 g