Unit 1: The Mole

Molecules <-> Moles

100

5.62 x 10²³ molecules of CaCl₂ to moles CaCl₂

0.933 moles of CaCl2₂

200

5.2 moles KBr to molecules KBr

3.13×10²⁴ molecules of KBr

300

1.25 x 10²⁵ molecules C₈H₁₀N₄O₂ to moles C₈H₁₀N₄O₂

20.8 moles 

400

2.5 millimoles ethanol to molecules of ethanol

1.51×10²¹ molecules of ethanol

500

6.125 x 10¹⁰ molecules chromium (IV) nitrate to micromoles chromium (IV) nitrate

1.02×10^-7 μmol

Molar Mass

100

Calculate the molar mass of NaCl

58.44 g/mol

200

Calculate the molar mass of carbon dioxide

44.01 g/mol

300

Calculate the molar mass of CuCl₂

134.45 g/mol

400

Calculate the molar mass of C₆H₁₂O₆

180.16 g/mol

500

Calculate the molar mass of manganese (IV) dichromate

486.94 g/mol

Grams <-> Moles

100

What do you call the mass of 1 mole of substance

Molar Mass

200

How many moles are in 12.011 g of Carbon

1 mole

300

What is the mass of 2.00 moles of O₂

64.0g

400

How many moles are there in 29.2 g of Sodium Chloride?

0.5 Moles

500

A sample has 88.0 g of iron (III) oxide. How many moles is this?

0.551 moles

Grams <-> Molecules

100

True or false: One mole of any substance always has the same mass. 

False

200

Which has more molecules: 1 mole of O₂ or 1 mole of CO₂?

Neither, they have the same

300

A 50.0 g sample of NaCl is given. How many molecules does it contain?

5.15 x 10²³ molecules

400

How many molecules are in 48.5 g of iron(III) sulfate

7.29×10²² molecules of Fe₂(SO₄)₃

500

How many atoms of oxygen are contained in 75.0 g of aluminum oxide?

1.33×10²⁴ oxygen atoms

Percent Composition

100

Find the percent composition of Carbon in CO₂

27.3% C

200

Find the percent composition of Al in Al₂O₃

52.9% Al

300

Find the percent composition of Oxygen in P₅O₁₀

50.8% O

400

Find the percent composition of beryllium nitride

Beryllium: 49.1%

Nitrogen: 50.9%

500

Find the percent composition of copper (I) sulfite

Copper (Cu): 61.4%

Sulfur (S): 15.5%

Oxygen (O): 23.2%