Question

Смешали 250г, 300г и 450г азотной кислоты, соответственно 20%, 30%,40% концентраций. Какова концентрация смеси?

Answer 1

концентрация смеси = (250 х 0,2) + (300 х 0,3) + (450 х 0,4) / (250+300+450) =

= (50 + 90 + 180) / (1000) = 320/1000 =0,32 х 100% =32 %

Answer 2

Calculating the Concentration of the Mixture

To calculate the concentration of the mixture, we can use the weighted average formula. The formula for calculating the weighted average concentration of a mixture is:

Weighted Average Concentration = (Mass of Component 1 * Concentration of Component 1 + Mass of Component 2 * Concentration of Component 2 + Mass of Component 3 * Concentration of Component 3) / Total Mass of Mixture

Given: - Mass of 250g of nitric acid with 20% concentration - Mass of 300g of nitric acid with 30% concentration - Mass of 450g of nitric acid with 40% concentration

Using the weighted average formula, we can calculate the concentration of the mixture.

Calculation: - Weighted Average Concentration = (250g * 20% + 300g * 30% + 450g * 40%) / (250g + 300g + 450g)

Result: - Weighted Average Concentration = (50g + 90g + 180g) / 1000g - Weighted Average Concentration = 320g / 1000g - Weighted Average Concentration = 32%

Therefore, the concentration of the mixture is 32%.