The Mole

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

What is the definition for Avogadro's number?

• number of grams per one mole of a substance
• whole number ratio that is a multiple of a chemical formula
• simplest, whole number ratio of a chemical formula
• 6.02 x 10^23 particles per one mole of a substance

How many moles are present in 32.3 grams of carbon dioxide (CO₂)?

• 44.01 moles
• 1421.52 moles
• 32.3 moles
• 0.73 moles

What is the mass of 2.50 mol of oxygen gas O₂?

• 40 g
• 80 g
• 16 g
• 32 g

How many water molecules are in 5.2 moles of water?

• 6.02 x 10²³
• 5.2
• 3.1304 x 10²⁴
• 8.638 x 10^-24

How many grams are in 3.3 moles of potassium sulfide?

• 21.6 g
• 33 g
• 235 g
• 3.6x10² g

What is the numerical value of Avogadro's number?

• 60.22x10²³
• 6.022x10²³
• 6.022x10³²
• 6.022x10²⁴

An element's molar mass is equivalent to the atomic number of the element.

• true

• false

Which element has a molar mass of 30.974 g/mol?

• Potassium

• Gallium

• Phosphorus

• Palladium