Measures of Concentration: Molarity

Question 1

A stock solution is made by dissolving 66.05 g of (NH4)2SO4 in enough water to make 250 mL of solution. A 10.0 mL sample of this solution is then diluted to 50.0 mL. Given that the molar mass of (NH4)2SO4 is 132.1 g/mol, what is the concentration of the new solution?Use and .

Revolt · Accepted Answer

0.400 M

Question 2

Which statement best explains the symbol [NaCl]?

Revolt · Accepted Answer

moles of NaCl per liter of solution

Question 3

How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?Use .

Revolt · Accepted Answer

0.50 mol

Question 4

A student prepares 150.0 mL of 1.40 M HCl using 35.0 mL of a stock solution. What is the concentration of the stock solution?Use .

Revolt · Accepted Answer

6.00 M

Question 5

In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?Use .

Revolt · Accepted Answer

200 g

Question 6

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?

Revolt · Accepted Answer

[K2CrO4] = 1.75 M

Question 7

A student takes a measured volume of 3.00 M HCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample?Use .

Revolt · Accepted Answer

30.0 mL

Question 8

Given that the molar mass of NaNO3 is 85.00 g/mol, what mass of NaNO3 is needed to make 4.50 L of a 1.50 M NaNO3 solution?Use .

Revolt · Accepted Answer

574 g

Question 9

A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution?Use .

Revolt · Accepted Answer

0.300 M

Question 10

Which best defines concentration?

Revolt · Accepted Answer

ratio that describes the amount of solute divided by the amount of solvent or solution

Measures of Concentration: Molarity Answers

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