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Molarity and molality

Total questions: 12

Worksheet time: 24mins

Name
Class
Date
1.

Molality (m) = moles of solute / _________________________.

a)

kilogram of solvent

b)

kiloliter of solvent

c)

kilometer of solvent

d)

ounces of solvent

2.

Molar mass of NaOH is ______________________(Na =23, H=1, O=16)

a)

40 grams/mol

b)

50 grams/mol

c)

45 grams/mol

d)

38 grams/nol

3.

molality is defined as ________________________

a)

the moles of solute per kilogram of solvent

b)

moles of solute per liter of solution

c)

mass of solute/ mass of solution

d)

mass of solute/ mass of solvent X 100

4.

Molarity is measured in _____.

a)

moles per g.

b)

mols per L.

c)

moles per mm.

d)

moles per mL.

5.

What do molarity and molality have in common?

a)

Both have "moles solute" in the numerator

b)

Both have "kg solvent" in the denominator

c)

Both have "L solution" in the denominator

d)

Both have "moles solution" in the denominator

6.

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

(Na =23, H=1, O=16)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

7.
How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
a)
1074 mol
b)
0.069 mol
c)
1.07 mol
d)
62.7 mol
8.

A beaker contain 795 mL of 0.35M of Na2SO4 solution. Calculate the mass of Na2SO4.

(Na =23, S=32, O=16)

a)

39.55 g

b)

40.00 g

c)

39.05 g

d)

39.5 g

9.
What is the molarity of 3 mole of hydrochloric acid in 3 L of water. 
a)
3
b)
1
c)
6
d)
9
10.
How many L are required to make 3.5 M hydrochloric acid using 1.1 moles? 
a)
3.18 L
b)
0.31 L
c)
3.85 L
d)
4.6 L
11.

THE volume of 0.14 of sodium chloride solution contains 1 mg of NaCl is (a)  

12.

CALCULATE THE mass of glucose C6H12O6 which is required to be dissolved in 563 g of ethanol C2H5OH to form a solution with concentration 2.4* 10210^{-2}   (a)  

(C =12, H=1, O=16)