Chemistry Checkpoint

What is the molar mass of carbon?

• 6.0 g/mol
• 12.0 g/mol
• 22.4 g/mol
• 6.02 x 10²³ g/mol

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.0500 moles
• 1.81 x 10⁴⁶ moles
• 5.00 x 10²¹ moles
• 5.00 moles

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 NaCl?

• 58 g/mol

• 28 g/mol

• 12 g/mol

• 6.02 x 10²³

We use the periodic table to calculate...

• mass
• molar mass
• moles

Which one has the most molecules or formula units?

• 1 mole H₂O

• 1 mole Al(OH)₃

• 1 mole NaCl

• They are all the same

What is the molar mass of one molecule of Nitrogen N₂?

• 14 amu (atomic mass units)

• 14 g

• 28 g

• 28 amu

Which has more molecules?

• 1 mole CO₂
• 1 mole of N₂O₄
• 1 mole of H₂O
• They are all the same

Carbon monoxide, a deadly gas, has a chemical formula of CO (one carbon atom with one oxygen atom). If you look at the total atomic mass of CO, does carbon or oxygen make up more of the mass?

• carbon

• oxygen

• they are exactly the same

• it is impossible to tell

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

• 29%

• 43%

• 57%

• 73%