What mass of calcium oxide is formed when 8 g of calcium is burned in oxygen?

The combustion reaction of calcium is described by the following chemical reaction equation:
Ca + 0.5 O2 = CaO;
From one mole of calcium, one mole of its oxide is formed.
Let’s determine the amount of substance in 8 grams of calcium.
M Ca = 40 grams / mol;
N Ca = 8/40 = 0.2 mol;
Let us determine the mass of 0.2 mol of calcium oxide.
M CaO = 40 + 16 = 56 grams / mol;
m CaO = 0.2 x 56 = 11.2 grams;