Math of Solutions

What is the percent by mass of a solution made by dissolving 20.0 g of NaCl into 180.0 g of water?

• 10.0 %

• 11.1 %

• 80.0 %

• 20.0 %

Answer explanation

20g / (180g+ 20g) x 100 = 10 %

What is the percent concentration of sugar in pink lemonade if 28 g of sugar is added to 209 g of water?

• 14.7 %

• 5.14 %

• 13.4 %

• 8.47 %

• 11.8 %

Answer explanation

28 g / ( 209g + 28g) x 100 = 11.8 %

What is the percent by mass of a solution made by dissolving 10.0 g of NaCl into 180.0 g of water?

• 5.26 %

• 5.56 %

• 18.0 %

• 20.0 %

Answer explanation

10 g / (10 g + 180 g) x 100 = 5.26 %

What is the molarity of a solution containing 4 moles of potassium chloride in 2.5 L of solution?

• 1.6 M

• 0.63 M

• 10 M

• 2.6 M

What volume is needed to make a 2.45 M solution of potassium chloride using 0.50 mol of potassium chloride?

• 4.9 L

• 0.20 L

• 1.23 L

• 0.40 L

How many moles of NaCl are needed to make 5.25 L of a 0.25 M solution?

• 1.3 mol

• 21 mol

• 0.048 mol

• 75.4 g

How many grams of potassium chloride would be dissolved in 5.50 L of a 0.250 M solution of potassium chloride?

• 1.48 g

• 103 g

• 1640 g

• 3.39 g

What is the molarity of a solution made by adding 1.565 moles of lead (II) nitrate to 0.5 L?

• 300. M

• 31.3 M

• 3.13 M

• 1.56 M

How many grams of sodium nitrate are needed to prepare 100 g of 15.0 % by mass sodium nitrate solution?

• 15 g

• 1275 g

• 12.75 g

• 150 g

What is the molarity of 4 grams of sodium chloride in 3,800 mL of solution?

• 0.018 M
• 0.018 mol
• 1.052 M
• 1.052 mol