What mass of silicon (4) oxide (kg) with a mass fraction of impurities of 10% should be used to obtain

What mass of silicon (4) oxide (kg) with a mass fraction of impurities of 10% should be used to obtain 395.28 kg of sodium silicate?

Let’s calculate the chemical amount of sodium silicate:

For this purpose, we divide its weight by the mass of 1 mole of the substance.

M Na2SiO3 = 23 x 2 + 28 + 16 x 3 = 122 grams / mol; n Na2SiO3 = 395 280/122 = 3 240 mol;

To get this amount of sodium silicate, you need to take the same amount of silicon dioxide.

Let’s find its mass.

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

M SiO2 = 28 + 16 x 2 = 60 grams / mol;

m SiO2 = 3 240 x 60 / 0.9 = 216 000 grams;