Molarity , Molality , Mole fraction

1.

Multiple Choice

1 min

1 pt

Molality (m) = moles of solute / _________________________.

kilogram of solvent

kiloliter of solvent

kilometer of solvent

ounces of solvent

2.

Multiple Choice

3 mins

1 pt

Molar mass of NaOH is ______________________

40 grams/mol

50 grams/mol

45 grams/mol

38 grams/nol

3.

Multiple Choice

3 mins

1 pt

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

4.

Multiple Choice

1 min

1 pt

molality is defined as ________________________

the moles of solute per kilogram of solvent

moles of solute per liter of solution

mass of solute/ mass of solution

mass of solute/ mass of solvent X 100

5.

Multiple Choice

2 mins

1 pt

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

True

False

6.

Multiple Choice

2 mins

1 pt

Molarity is measured in _____.

moles per g.

mols per L.

moles per mm.

moles per mL.

7.

Multiple Choice

5 mins

1 pt

What is the mass of 0.75 moles of (NH₄)₃PO₄?

101.75 g

121.75 g

111.75 g

131.75 g

8.

Multiple Choice

5 mins

1 pt

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

9.

Multiple Choice

45 sec

1 pt

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

10.

Multiple Choice

45 sec

1 pt

Which equation is used to find molarity?

Moles solute/L solution

Moles solute/kg solution

Moles solute/kg solvent

Grams solute/L solution

11.

Multiple Choice

45 sec

1 pt

Which equation is used to find molality?

Moles solute/L solution

Moles solute/kg solution

Moles solute/kg solvent

Grams solute/L solution

12.

Multiple Choice

3 mins

1 pt

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

13.

Multiple Choice

5 mins

1 pt

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

14.

Multiple Choice

30 sec

1 pt

What is the molarity in 650. ml of solution containing 63 grams of sodium chloride?

2.4 M

0.86 M

1.7 M

0.54 M

15.

Multiple Choice

5 mins

1 pt

Total number of mol fraction for all component in the solution is equal to

1.0

0.95

0.50

2.0

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