Free Printable CONCENTRATION

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CONCENTRATION

Total questions: 24

Worksheet time: 1hrs 5mins

Name

Class

Date

Molality (m) = moles of solute / _________________________.

kilogram of solvent

kiloliter of solvent

kilometer of solvent

ounces of solvent

Molar mass of NaOH is ______________________

40 grams/mol

50 grams/mol

45 grams/mol

38 grams/nol

What is the molality of a solution made by dissolving 2 moles of NaOH in 400 grams of water?

5 mol/kg. solvent

4 mol/kg solvent

3 mol/kg. solvent

2.5 moles /kg solvent

True or False? The higher the concentration of a solution the less solutes it has in it.

True

False

Molarity is measured in _____.

moles per g.

mols per L.

moles per mm.

moles per mL.

What is a solvent?

The substance that does the dissolving in a solution.

The substance that is being dissolved in a solution.

The mixing of different substances.

The process in which neutral molecules lose or gain electrons.

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?

1074 mol

0.069 mol

1.07 mol

62.7 mol

What do molarity and molality have in common?

Both have "moles solute" in the numerator

Both have "kg solvent" in the denominator

Both have "L solution" in the denominator

Both have "moles solution" in the denominator

How do you convert from grams to moles?

Divide by the molar mass

Multiply by the molar mass

Divide by Avogadro's number

Multiply by Avogadro's number

10.

What are the units of molality?

11.

What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?

2.0 M

0.22 m

135 m

2.0m

12.

How many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide?

13.

What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?

0.018 M

0.0011 M

1.052 M

0.062 M

14.

How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?

0.625 g NaCl

625 g NaCl

36.5 g NaCl

0.04 mol NaCl

15.

Find the molarity of 186.55 g of sucrose, C₁₂H₂₂O₁₁ (MM = 342) in 250 mL of water.

2.18 M

0.746 M

1.18 M

0.545 M

16.

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250 mL?

15.9 M

0.636 M

0.642 M

1.59 M

17.

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 %

18.

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

400 g

40 g

0.25 g

25 g

19.

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 %

20.

How many grams of NaNO₃ are needed to prepare 100 g of 15.0 % by mass NaNO₃ solution? (MM = 85 g/mol)

15 g

1275 g

12.75 g

150 g

21.

What is the mole fraction of NaOH in an aqueous solution that contains 22.8% NaOH by mass?

0.571

0.11

4.288

4.859

22.

suppose a hydrochloric acid solution contains 36 g of HCl and 64 g of H₂O.what is the mole fraction of HCl?

0.78

0.99

0.22

3.6

23.

The sum of all mole fractions equal

0.1

24.

the number of moles of solute or solvent in a solution divided by the total number of moles of solute and solvent is known as

molarity

mole fraction

molality

percent by mass

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CONCENTRATION

Total questions: 24

Worksheet time: 1hrs 5mins

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