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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