In the production of cast iron, calcium carbonate, which is part of the slag, decomposes at high temperatures.

In the production of cast iron, calcium carbonate, which is part of the slag, decomposes at high temperatures. calculate the mass of calcium oxide formed during the decomposition of 300 g of calcium carbonate.

The decomposition of calcium carbonate: CaCO3 = CaO + CO2
Find the amount of calcium carbonate substance n = m / M = 300 g / 100 g / mol = 3 mol. According to the reaction, 1 mol of calcium oxide is formed from 1 mol of carbonate, which means n (CaCO3) = n (CaO) = 3 mol. Then the mass of calcium oxide: m = n * M = 3 mol * (40 + 16) g / mol = 168 g (M is the molar mass, determined by the periodic table).
Answer: the mass of calcium oxide is 168 g.