280 g of calcium oxide received 358 g of calcium hydroxide. Calculate the mass fraction of the calcium hydroxide effluent.

univerkov | July 6, 2021 | education

Calcium oxide mass – 280 g.

Calcium hydroxide mass – 358 g.

Determine the mass fraction of calcium hydroxide.

First, you should write down the reaction equation.

CaO + H2O = Ca (OH) 2.

Let’s determine the molar mass of calcium oxide and calcium hydroxide.

M (CaO) = 40 + 16 = 56 g / mol.

M (Ca (OH) 2) = 40 + 17 * 2 = 74 g / mol.

Using the reaction equation, we determine the mass of calcium hydroxide.

280 g of calcium oxide – x g of calcium hydroxide.

56 g / mol CaO – 74 g / mol Ca (OH) 2.

X = 280 * 74: 56 = 370 g.

Next, we determine the mass fraction of calcium hydroxide.

W = 358/370 * 100 = 96.8%.

Answer: W = 96.8%.

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