Question

What is the mass percent when 66 grams of NaCl is dissolved in 255 grams of water?

Answer 1

INFORMATION:

We have:

- 66 grams of NaCl

- 255 grams of water

If the NaCl is dissolved into the water, we must find the mass percent

STEP BY STEP EXPLANATION:

To find the mass percent we must must use the next formula

`\text{ mass percent}=\frac{\text{ mass of solute}}{\text{ mass of solution}}*100`

In our case,

- the solute is NaCl

- the solution would be the sum of masses from NaCl and water

Then,

- mass of solute = 66 g

- mass of solution = 66 g + 255 g = 321 g

Finally, replacing in the formula,

`\text{ mass percent}=(66g)/(321g)*100=20.5607`

ANSWER:

The mass percent when 66 grams of NaCl is dissolved in 255 grams of water is 20.60%