# From 20 kg of CaCO3 limestone (3-index), containing 4% of impurities, 12 kg of Ca (OH)

From 20 kg of CaCO3 limestone (3-index), containing 4% of impurities, 12 kg of Ca (OH) 2 were obtained (twice). What percentage is this compared to the theoretical yield?

From 1 mole of limestone it is possible to synthesize 1 mole of slaked lime.

Let’s calculate the available chemical amount of limestone.

M CaCO3 = 40 + 12 + 16 x 3 = 100 grams / mol;

N CaCO3 = 20,000 x 0.96 / 100 = 192 mol;

The same amount of slaked lime can be synthesized.

Let’s calculate the theoretical chemical amount and weight of slaked lime.

M Ca (OH) 2 = 40 + 16 x 2 + 2 = 74 grams / mol;

m Ca (OH) 2 = 192 x 74 = 14 208 grams;

The reaction yield is 12,000 / 14.208 = 0.845 = 84.5%; 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.