Calculate the amount of substance corresponding to 12.6 g of nitric acid.

To find the amount of nitric acid substance, it is necessary to use the formula v = m / Mr, where m is the mass of the substance, v is the amount of the substance, Mr is the molecular weight.

Mr (HNO3) = 63 g / mol.

v = 12.6 / 63 = 0.2 mol.

Answer: 12.6 g of nitric acid is 0.2 mol.

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