Question

Объём (н.у.) формальдегида, который потребуется для получения 1 л формалина (р = 1,11 г/мл) с массовой долей формальдегида 40%, равен (с точностью до десятых)

Answer 1

M=1.11*1000=1110(Формалин)
m(формалдегид)=(1110*40)/100=444
V=(444*22.4)/30=331.52

Answer 2

Calculating the Volume of Formaldehyde

To calculate the volume of formaldehyde needed to obtain 1 liter of formalin with a mass fraction of formaldehyde of 40%, we can use the following formula:

Volume of formaldehyde (V) = (mass of formalin / density of formalin) * mass fraction of formaldehyde

Given: - Mass of formalin = 1 liter - Mass fraction of formaldehyde = 40% - Density of formalin (ρ) = 1.11 g/ml

Calculation

Using the given values, we can calculate the volume of formaldehyde required:

V = (1 liter / 1.11 g/ml) * 0.40

V ≈ (0.9009) * 0.40

V ≈ 0.3604 liters

Therefore, with a mass fraction of formaldehyde of 40%, the volume of formaldehyde required to obtain 1 liter of formalin is approximately 0.3604 liters.