Question

Гидроксид натрия массой 50 г расстворили в 200 г воды. определите массовую долю вещества в растворе.

Answer 1

Массовая доля определяется по формуле:

w (NaOH) = m(NaOH)/m(Всего расствора)= 50/(200+50)=0.2
массовая доля гидроксида натрия равна 0.2

Answer 2

Calculation of Mass Fraction in Solution

To determine the mass fraction of the substance in the solution, we need to calculate the mass of the solute (sodium hydroxide) and the total mass of the solution.

Given: - Mass of sodium hydroxide (solute) = 50 g - Mass of water (solvent) = 200 g

To calculate the mass fraction, we need to divide the mass of the solute by the total mass of the solution and multiply by 100 to express it as a percentage.

The formula for calculating the mass fraction is:

Mass Fraction = (Mass of Solute / Total Mass of Solution) * 100

Let's substitute the given values into the formula:

Mass Fraction = (50 g / (50 g + 200 g)) * 100

Simplifying the equation:

Mass Fraction = (50 g / 250 g) * 100

Mass Fraction = 0.2 * 100

Mass Fraction = 20%

Therefore, the mass fraction of the substance (sodium hydroxide) in the solution is 20%.