Unit 5 Test - Mass Relationships in Compounds

In chemistry, a "mole" is:

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

The number 6.02 x 10²³ is called...

• Obama's number
• Bohr's number
• Trump's number
• Avogadro's number

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

What is the molar mass of sodium?

• 11
• 23
• 45.98
• 3

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

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

Calculate the molar mass of Cu₂O.

• 37 g/mol

• 45 g/mol

• 79.5 g/mol

• 143 g/mol

How many molecules are there in 5.5 moles potassium chloride?

• 4.08 x 10^-24

• 3.31 x 10²⁴

• 33.11

• 0.98

How many moles are 2.85 x 10²⁰ atoms of iron?

• 4.73 x 10^-4 moles
• 1.72 x 10⁴ moles
• 1.72 x 10^-42 moles
• 4.73 x 10⁴ moles

A mass of 6 g of Carbon contains

• 1 mole of C
• 2 moles of C
• 0.5 moles of C
• 72 moles of C