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Molarity And Dilution
Test Description: Calculations of moles, liters, molarity, and dilutions.
Instructions: Answer all questions to get your test result.
1) Another way to write molarity (M) is
A
grams/liter
B
grams/molar mass
C
molar mass/liter
D
moles/liter
2) A solution contains 3 moles of HCl in 6 L of solution. What is the molarity?
A
1.0 M
B
0.5 M
C
18.0 M
D
2.0 M
3) What is the molarity of a solution that contains 125 g NaCl in 4.00 L of solution?
A
31.3 M
B
0.535 M
C
2.14 M
D
8.56 M
4) What is the number of moles in 0.250 L of a 0.4M solution?
A
0.62 moles
B
1.6 moles
C
0.16 moles
D
0.10 moles
5) How many mL of a 2.0 M NaBr solution are needed to make 200 mL of 0.5 M NaBr?
A
150 mL
B
25 mL
C
50 mL
D
100 mL
6) If 400 mL of a 8.0 M solution is diluted to a molarity of 5.3M, what is the end volume of solution?
A
200 mL
B
400 mL
C
180 mL
D
600 mL
7) Which of the following is the correct formula for calculating molarity?
A
theoretical yield/actual yield
B
moles/liters of solution
C
moles/kg of solvent
D
# particles/Avogadro's #
8) How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
A
1.07 mol
B
0.069 mol
C
1074 mol
D
62.7 mol
9) How do you convert from grams to moles?
A
Divide by Avogadro's number
B
Divide by the molar mass
C
Multiply by Avogadro's number
D
Multiply by the molar mass
10) What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO3 to a volume of 250 mL?
A
0.636 M
B
0.642 M
C
15.9 M
D
1.59 M
*select an answer for all questions
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