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Lujan Molarity Practice
Test Description: 4th 9 Weeks 2nd Test
Instructions: Answer all questions to get your test result.
1) 0.450 moles of NaCl are dissolved in 95.0 mL of water. Calculate the molarity of the NaCl solution.
A
4.7 M
B
0.0047 M
C
0.21 M
D
2.1 M
2) How many moles of Ca(NO3)2 are there in 75 mL of 0.25 M solution?.
A
3.33 mol
B
0.0188 mol
C
0.00333 mol
D
18.8 mol
3) 15 g of NaCl occupy a volume of 75 mL. What is the molarity of the solution?
A
0.29 M
B
0.0034 M
C
3.4 M
D
0.019 M
4) 45.0 g of Ca(NO3)2 was used to create a 1.3 M solution. What is the volume of the solution?
A
0.021L
B
0.21 L
C
2.1L
D
21L
5) What is the molarity of a solution that contains 1.50 mol HCl in 2.50 L of solution?
A
6.0 M
B
0.3 M
C
0.6 M
D
60 M
6) How many moles of C12H22O11 are needed to prepare 2.50 L of 0.300 M solution?
A
0.65 mol
B
7.5 mol
C
0.70 mol
D
0.75 mol
7) What is the molarity of a solution that contains 122 g of MgSO4 in 3.5 L of solution?
A
0.630 M
B
0.271 M
C
0.550 M
D
0.290 M
8) How many moles of KI are present in 0.85 L of a 0.55 M KI solution?
A
3.10 mols
B
1.55 mols
C
0.4675 mols
D
0.935 mols
9) What is the molar mass of CuFeS2?
A
3.07 X 10^24
B
152 g
C
1.108 X 10^26 g
D
184 g
10) What was the molarity of a solution containing 4.5 moles of NaCl in 100 ml? (first convert to liters)
A
45 M
B
0.776 M
C
0.045 M
D
0.078 M
11) How many ml of solution are needed to make a 5.78 M solution with 2.98 moles of CaO? (hint the answer is in Liters and you must convert to ml)
A
0.52 ml
B
53.2 ml
C
516 ml
D
0.0532 ml
12) How many grams of NiCl2 are in 2.56 moles?
A
~253.44 g
B
~ 330g
C
~0.026 g
D
~1.54 x 10^24 g
13) 0.450 moles of NaCl are dissolved in 95.0 mL of water. Calculate the molarity of the NaCl solution. Convert ml to liters first
A
2.1 M
B
4.7 M
C
0.21 M
D
0.0047 M
14) 42.0 g of Ca(NO3)2 was used to create a 1.3 M solution. What is the volume of the solution?
A
2.0L
B
20L
C
.02L
D
0.2L
15) What is the molarity of a solution containing 5 moles of solute in 250 milliliters of solution? Convert to liters first
A
0.2 M
B
2 M
C
20 M
D
200 M
*select an answer for all questions
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