Question

A solution is made by dissolving 125 g of sodium chloride in 1.5 kg of water what is the percent by mass?

Answer 1

Answer:

8.33 percent

Explanation:

Answer 2

Concept:

A substance's concentration can be stated using a number of different units, including moles, percent (%) weight/volume, molarity, molality, parts per million (ppm), and mole fraction. The concentration reveals how much solute is present in a given amount of solvent.

Given:

The mass of sodium chloride is 125 grams.

The mass of water is 1.5 kg.

Find:

The percent by mass of sodium chloride.

Solution:

The mass of sodium chloride is 125 grams.

The mass of water is 1.5 kg = 1500 grams.

The formula for percent by mass is given as:

$\text{percent mass}=\frac{\text{mass of solute}}{\text{mass of solution}} \times 100$ %

We know that Solution = Solute + Solvent

Solution = 125 g + 1500 g = 1625 grams

Therefore, the percent mass of sodium chloride will be:

$\text{percent mass}=\frac{125}{1625} \times 100$ %

$\text{percent mass}=7.629%$ %

The percent by mass of sodium chloride is 7.629%.

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