In 200 g of H2O, 42.6 g of P2O5 was added. It is necessary to find the mass fraction of P2O5.

The term mass fraction of a substance is the ratio between the mass of a given substance and the mass of the entire solution. It is calculated by the formula:

w = m substance / m solution;

Usually expressed as a percentage.

w = m substance / m solution * 100%.

w = (42.6 / (200 + 42.6)) * 100% = (42.6 / 242.6) * 100% = 17.56%.

Answer: the mass fraction of P2O5 in an aqueous solution is 17.56%.

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