Molarity and Mass Percent
Authored by Lisa Thompson
Science
12th Grade
NGSS covered
Used 2+ times
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25 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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 %
Answer explanation
20g / (180g+ 20g) x 100 = 10 %
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of a solution made by dissolving 10.0 g of NaCl into 180.0 g of water?
5.26 %
5.56 %
180.0 %
20.0 %
Answer explanation
10 g / (10 g + 180 g) x 100 = 5.26 %
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of a solution containing 56.5 g of salt in 500 g of water?
11.3 %
5.56%
8.85%
10.2 %
Answer explanation
56.5g / ( 56.5g + 500g) x 100 = 10.2 %
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)
0.8 M
1.5M
3.0M
6.0M
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the molarity of a solution that contains 5 moles of solute in 2 liters of solution?
2.5 M
5 M
10 M
0.4 M
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the definition of molarity?
The mass of a substance in grams
The number of particles in a substance
The number of moles of solute per liter of solution
The volume of solvent in liters
Tags
NGSS.HS-PS1-5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is the correct formula for calculating molarity?
moles/liters of solution
moles/kg of solvent
# particles/Avogadro's #
theoretical yield/actual yield
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