Calculate the mass of potassium hydroxide with a chemical amount of 1.5 mol.

Using the formula n = m / M, in which n is the amount of substance (mol), m is the mass (g), M is the molar mass (g / mol), we derive the mass formula: m = n * M.
The molar mass of a substance can be calculated by the formula: M (KOH) = Ar (K) + Ar (O) + Ar (H), where Ar is the atomic mass of an element, it can be viewed in the periodic table of elements of Mendeleev.
M (KOH) = 39 + 16 + 1 = 56 (g / mol).
Knowing all the unknowns, we find the mass by the formula: m = n * M.
m = 56 * 1.5 = 84 (g).
Answer: 84 g.

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