Moles Exam Review

Molar mass is the

• atomic mass of atoms in a compound

• sum of the atomic masses of all atoms in acompound

• amount of moles in a compound

What is the molar mass of one mole of HCl?

• 79.92 grams per mole of HCl

• 36.46 grams per mole of HCl

• 35.45 grams per mole of HCl

• 1.01 grams per mole of HCl

In chemistry, a "mole" is:

• The mass of an atom
• a large number used to count particles
• based on the volume of a substance

Tags

NGSS.HS-PS1-7

The mole concept is important in chemistry because

• it allows us to distinguish between elements and compounds.
• atoms and molecules are very small and the mole concept allows us to count atoms and molecules by weighing macroscopic amounts of material.
• it establishes a standard for reaction stoichiometry.
• it provides a universally accepted standard for mass.

Tags

NGSS.HS-PS1-7

Which of the following units in expressing the amount of substance in terms of the number of particles?

• liter
• gram
• mole
• Celcius

Find the number of moles in 25 grams of HF?

• 1.25 mol HF
• 25 mol HF
• 0.8 mol HF
• 80 mol HF

How many moles are in 564 grams of Copper?

• 0.11 mol Cu
• 25 mol  CU
• 87 mol Copper
• 8.87mol Cu

How many grams is 1.2 moles of Neon?

• 0.05 grams
• 16.6 grams
• 21.2 grams
• 24 grams

How many moles is 4 grams of Calcium?

• 0.10 moles
• 10 moles
• 44 moles
• 160 moles

Find the number of moles in 25 grams of HF?

• 1.25 mol HF
• 25 mol HF
• 0.8 mol HF
• 80 mol HF