How many kilograms of 80% phosphoric acid can be obtained from 31 kg of phosphorus containing 5% of the notes?

Let’s calculate the chemical amount of a substance in phosphorus weighing 31 kilograms.

M P = 31 grams / mol;

N P = 31 000/31 = 1000 mol;

A phosphoric acid molecule contains 1 phosphorus atom. Therefore, from 1000 mol of phosphorus oxide, 1000 mol of acid can be obtained.

Let’s calculate its weight.

To do this, we multiply the amount of the substance by its molar weight.

M H3PO4 = 3 + 31 + 16 x 4 = 98 grams / mol;

m Н3РО4 = 1000 x 98 = 98,000 grams = 98 kg.