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The saline (salt) solution is 0.9% by mass which is similar to tears, blood, and other body fluids. which of the following might be a recipe used in a commercial saline solution?
A. 0.9 g of salt and 100 g water.
B. 0.9 g of salt and 99.1 g water.
C. 0.9 g of salt and 100.9 g water.
D. 0.9 g of salt and 91 g water.

Option a; 0.9 g of salt and 100 g water

Explanation:

0.9% by mass indicates a sort of concentration.

A percent by mass shows, the grams of solute which are contained in 100 g of solution, so:

Mass of solute = 0.9 g

Mass of solvent = Mass of solution - mass of solute

100 g - 0.9g = 99.1 g of water

Mass of solution = 100 g the best option that matches this, is B.

There are other types of concentration in addition to the percentage by mass

% by volume → mL of solute in 100 mL of solution

% by mass/volume → grams of solute in 100 mL of solution