Calculate the mass of phosphoric acid obtained in the laboratory from 9.3 g of phosphorus.

Calculate the mass of phosphoric acid obtained in the laboratory from 9.3 g of phosphorus. Write down the reaction equation and indicate the oxidation state of all elements.

Let’s calculate the chemical amount of a substance in phosphorus weighing 9.3 grams.

M P = 31 grams / mol;

N P = 9.3 / 31 = 0.3 mol;

The phosphoric acid molecule contains one phosphorus atom, therefore, 0.3 mol of acid can also be obtained from this amount of phosphorus.

Let’s calculate its weight.

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

M Н3РО4 = 3 + 31 + 16 x 4 = 98 grams / mol;

m Н3РО4 = 0.3 x 98 = 29.4 grams.