Nitric acid has the formula: HNO3.
The molar concentration is found by the formula: Cm = n / Vr – pa, where n is the amount of solute, Vp – pa is the volume of the solution.
Under the conditions of this problem, the volume of the solution is 200 ml, and we can calculate the amount of nitric acid by dividing the mass of nitric acid (given in the problem statement) by the molar mass of nitric acid (calculated according to the periodic table.
M (aza acid) = 1 + 14 + 16 * 3 = 63.
n = 12.6 / 63 = 0.2 mol.
Cm = 0.2 / 0.2 L = 1 mol / L – the answer.
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