Mole Concept

Molar Mass

100

What is the molar mass of an element? How do we determine it?

Molar mass is the mass of one mole of a substance in grams. We calculate it by referencing the periodic table and if there are more than one element in a compound, we add them together. The units are g/mol

200

What is the molar mass of BF₃?

68 g/mol

300

What is the molar mass of Mg(OH)₂?

58 g/mol

400

What is the molar mass of H₃PO₄?

98 g/mol

500

What is the molar mass of Ga₂(SO₃)₃?

380 g/mol

Grams, Atoms, and Moles (oh my!)

100

What is the mass of 5 moles of Fe₂O₃?

800 g 

200

Find the number of moles of argon in 452 g of argon.

11.3 mol

300

How many moles of magnesium is 3.01 x 10²² atoms of magnesium?

0.05 mol

400

Find the mass in grams of 2.00 x 10²³ molecules of F₂.

12.7 g 

500

How many molecules are in 10 g of aspartame (C₁₄H₁₈N₂O₅)?

2.04 x 10²² molecules

Percentage composition

100

What percentage by mass of hydrogen is in water?

11.1%

200

What percentage by mass of potassium is in KMnO₄?

34.8%

300

What percentage by mass of carbon is in CH₃COCH₃?

62.1%

400

What is the percentage composition of oxygen in the air (nitrogen, oxygen, carbon dioxide and hydrogen) if the mixture is composed of 1 mol of each gas?

30.2%

500

What is the percentage composition by mass of 0.038 mol of iron (II) in an iron salt that has a mass of 28.7 g?

7.4%

Volumes of Gases

100

What is are the conditions of a gas at stp?

0 degrees Celcius and 1 atm

200

What volume is occupied by 15 mol of carbon dioxide gas at stp?

336 dm³

300

What is the volume of 0.003 mol of ammonia gas at rtp?

0.072 dm³

400

What volume is occupied by 4.35 x 10²¹ molecules of oxygen gas at rtp?

0.174 dm³

500

What is the volume of 0.056 kg of steam at stp? 

69.7 dm³

Mass Of Element

100

What is the atomic mass of Oxygen?

16

200

What is the atomic mass of Carbon?

12

300

What is the atomic mass of Silicon?

28

400

What is the atomic mass of Magnesium?

24

500

What is the atomic mass of Chlorine?

35.5