You added 20 g of NaCl to 100 g of water. What is the percent by mass of the solute?

We are given:

Mass of solvent (water) = 100 grams

Mass of solute (NaCl) = 20 grams

Mass of the Solution:

Mass of Solution = Mass of Solute + mass of Solvent

100 + 20 = 120 grams

Mass Percent of NaCl:

We know that

mass percent of NaCl = (Mass of NaCl / Mass of Solution) * 100

replacing the variables

Mass% of NaCl = (20 / 120)*100

Mass% of NaCl = 100 / 6

Mass% of NaCl = 16.67%

Explanation:

d. groundwater flows through the subsoil and deposits minerals.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)