Percent by Mass Solution

Suppose that a solution was prepared by dissolving 18.0 g of sugar into 100g of water. The percent by mass in the nearest whole number would be calculated as follows:

• 15%

• 18%

• 6%

• 82%

If a solution is prepared from 5g NaCl in enough water to make a 120mL solution, the mass-volume concentration is:

• 0.04%

• 4.2%

• 24%

• 6.7%

A 20g tube of cream contains 1.2% (w/w) of active ingredient. What is the mass of the active ingredient does the cream contain?

• 0.24%

• 2.4%

• 0.94%

• 9.4%

To find ________________ we divide mass ofg solute with the mass of solution times 100.

• percent by mass

• percent by volume

• parts per hundred

Complete the formula for % Composition.

a

b

c

100

total mass of compound

mass of element

Tags

NGSS.MS-PS1-5

What is the concentration, in percent by mass, of 0.62 g of solute in 45.0 g of solution?

• 0.014 %

• 0.13%

• 1.4 %

What is the perecent by mass of a solution that contains 12.0 g of solute per 200.0 g solution?

• 5.6 %

• 6 %

• 2.4 %

What mass of water should be added to 22.0 g of KCl to make 5.50% by mass solution?

• 400 g

• 25 g

• 0.25 g

What is the mass percent of 125 grams of fructose dissolved in 375 ml of water?

• 25.0%

• 5.5%

• 250%

Calculate the mass % concentration of 38.5 aqueous solution that contains 1.96 g of Nabr.

• 5.2%

• 5.09%

• 509%