Free Printable Unit 3 Mole

Worksheets

Unit 3 Mole

Total questions: 20

Worksheet time: 1hrs 25mins

Name

Class

Date

How many molecules of sugar (C₆H₁₂O₆) are in a mole?

24 molecules

180 molecules

180 g

6.02 x 10²³molecules

How many atoms of carbon are in 6.00 g of carbon?

1.20x10²⁴atoms C

6.02x10²³atoms C

3.01x10²³atoms C

1.50x10²³atoms C

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

28.2 g

55.8 g

6.02 g

1.2 g

How many moles are in 3.01 x 10²² atoms of magnesium?

0.05 moles

1.81 x 10⁴⁶ moles

5.00 x 10²¹ moles

5 moles

What are the units for molar mass?

amu

g mol^-1

How many grams of silicon (atomic mass = 28.1 amu) would there be in a sample that contained 9.99 x 10²² atoms?

1.69 g

4.66 g

1.66 g

1.79 g

What is the definition for Avogadro's number?

number of grams per one mole of a substance

whole number ratio that is a multiple of a chemical formula

simplest, whole number ratio of a chemical formula

6.02 x 10^23 particles per one mole of a substance

How many grams are in 3.3 mol of Potassium Sulfide? (atomic mass: K = 39.1 g mol^-1; S = 32.1 g mol^-1)

364 g

454 g

238 g

132 g

What is the molarity of 4 g of NaCl (M_rNaCl=58.45 g mol^-1) in 3800 mL of solution?

0.018 M

0.0011 M

1.052 M

0.062 M

10.

Find the molarity of 186.55 g of sucrose, C₁₂H₂₂O₁₁ (M_r sucrose = 342 g mol^-1) in 250 mL of water.

2.18 M

0.746 M

2.18 x 10^-3 M

746 M

11.

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250 mL?

15.9 M

0.636 M

0.642 M

1.59 M

12.

Molarity is measured in

moles per kg

mol per L

moles per kJ

moles per mL

13.

How many grams of AgNO₃ are needed to prepare 0.125 M solution in 250 mL of water? (M_r =169.87 g mol^-1)

0.03 g

0.5 g

5.3 g

84.9 g

14.

You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution.

Add 160 mL of water to the initial solution

Add 160 grams of water to the initial solution

Evaporate 160 mL from the initial volume

The experiment cannot be conducted with the materials provided

15.

Molarity is ...

grams of solute/deciliters of solvent.

grams of solute/liters of solution.

moles of solute/liters of solution.

moles of solute/milliliters of solvent.

16.

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300 mL of 2.00 M NaOH by dilution?

0.067 mL

60.0 mL

100 mL

125 mL

17.

What is the empirical formula if you have 88.80% copper and 11.20% oxygen? (M_r (Copper) = 63.5 g mol^-1; M_r (Oxygen) = 16.0 g mol^-1)

Cu₃O₈

CuO₄

Cu₂O

Cu₄O₁₀

18.

A sample of a compound consisting of calcium and chlorine contains 1.82 g of calcium and 3.23 g of chlorine. What is the empirical formula? (M_r (Ca) = 40.1 g mol^-1; M_r (Cl) = 35.5 g mol^-1)

CaCl₂

Ca₂Cl₄

Ca₂Cl₂

Ca₄Cl₂

19.

The ___ is the thing being dissolved

solute

solvent

20.

How many grams of AgNO₃ are needed to prepare 0.125M solution in 250 mL of water? (the molar mass of AgNO₃ is 169.87 g mol^-1)

0.03 g

0.5 g

5.31 g

84.9 g

100 %

Unit 3 Mole

Total questions: 20

Worksheet time: 1hrs 25mins

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