Mole, Molar Mass & Conversions Review

What is the mole used for?

• To measure the mass of a substance

• To measure the number of atoms or molecules in a substance

• To measure the amount of energy in a substance

• To measure the volume of a substance

What is Avogadro's Number? 

• 6.02 x 10²³
• - 6.02 10²³
• 6.02 x 10²²
• 6,020,000,000,000

Tags

NGSS.HS-PS1-7

How many molecules are in 1 mole of NaCl?

• 6.02 x 10²³

• 58

• 11

• 17

The molar mass is found by

• adding the masses of all the atoms in the molecule.

• dividing the total mass of all the atoms in the molecule by 6.02 x 10²³.

• multiplying the total mass of all the atoms in the molecule by 6.02 x 10²³.

• dividing the total mass of all the atoms in the molecule by the total number of atoms.

What are the units for molar mass?

• grams or g

• amu

• grams/mole or g/mol

• moles or mol

One mole of potassium atoms has a mass of

• 30.974 g

• 39.098 g

• 209 g

• 6.022 x 10²³ g

What is the molar mass of H₂O?

• 6.02 x 10²³ grams

• 17.007 grams

• 18.015 grams

• 15.999 grams

What is the correct molar mass of Ag₃PO₄?

• 418.58 g/mol

• 387.61 g/mol

• 154.84 g/mol

• 52.32 g/mol

What is the molar mass of table salt (NaCl)?

• 116.88 g/mol

• 35.45 g/mol

• 22.990 g/mol

• 58.44 g/mol

How many moles are in 20 grams of Ca (Calcium)?

• 0.50 mol

• 6.02x10²³ mol

• 2 mol

• 20 mol