Question

What mass of mgf2 is contained in 80.85 g of a 22.4% by mass solution of mgf2 in water?

Answer 1

Formula: % by mass = (mass of solute / mass of solution] *100

Data:

mass of solution = 80.85 g

% by mass = 22.4%

Unknown = mass of solute

Solution

% by mass = (mass of solute / mass of solution] *100 = >

mass of solute = % by mass * mass of solution / 100

mass of solute = 22.4 * 80.85 / 100 = 18.11 g

Answer: 18.11 g

Answer 2

Answer : The mass of $MgF_2$ contained is, 18.1104 grams

Solution : Given,

Given mass of solution = 80.85 g

22.4% by mass solution of $MgF_2$ means that 22.4 grams of $MgF_2$ present in 100 gram of solution.

As, 100 grams of solution contains 22.4 grams of $MgF_2$

So, 80.85 grams of solution contains $\frac{22.4}{100}\times 80.85=18.1104$ grams of $MgF_2$

Therefore, the mass of $MgF_2$ contained is, 18.1104 grams