Question

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

Answer 1

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

Answer 2

The mass of MgF2 used is 18.1 g.

Mass of MgF2 = ?

Mass of solution = 80.85 g

Percentage by mass of solution = 22.4%

Percent concentration is one of the ways of expressing concentration in chemistry. The percent concentration is obtained from;

% concentration =  Mass of solute/Mass of solution × 100/1

Let the mass of solute be x

Substituting values;

22.4 = x/80.85 × 100/1

x = 22.4 × 80.85/100

x = 18.1 g

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