Question

В воде массой 120г растворили 18г гидроксида калия. Рассчитать массовую долю гидроксида калия в полученном растворе.

Answer 1

W = m1/m2
w(KOH) = 18/(120 + 18) = 0,13 (13%)
Ответ: 0,13 или 13%.

Answer 2

Calculation of Mass Fraction of Potassium Hydroxide in the Solution

To calculate the mass fraction of potassium hydroxide (KOH) in the solution, we need to know the masses of both the KOH and the solution.

Given: - Mass of the solution = 120 g - Mass of potassium hydroxide (KOH) = 18 g

To calculate the mass fraction, we use the formula:

Mass Fraction = (Mass of KOH / Mass of Solution) * 100%

Substituting the given values into the formula:

Mass Fraction = (18 g / 120 g) * 100%

Calculating the mass fraction:

Mass Fraction = 0.15 * 100% = 15%

Therefore, the mass fraction of potassium hydroxide (KOH) in the solution is 15%.

Please note that the sources provided did not contain specific information related to the given question. The calculation is based on the provided information and general knowledge of calculating mass fractions.