What mass of phosphoric acid corresponds to the amount of substance 0.2 mol?

1) According to the periodic table, we calculate the molar mass of orthophosphoric acid (H3PO4). To do this, add up the atomic mass of all components of the substance: 1 * 3 + 31 + 16 * 4 = 98.
2) Find the mass of the acid corresponding to 0.2 mol of the substance. To do this, we multiply the amount of substance by the molar mass: 98 * 0.2 = 19.6 g – the answer.

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