The Mole

Molar mass is in units of ________.

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

Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titanium?

• 1 g Ti / 47.84 mol Ti
• 1 mol Ti / 47.84 g Ti
• 47.84 mol / 1 g Ti
• 47.87 g Ti / 1 mol Ti

Which compound has the smallest molar mass?

• CO
• CO₂
• H₂O
• H₂O₂

Which represents the greatest mass of sulfur?

• 1 gram of sulfur
• 1 molecule of sulfur
• 0.5 mole of sulfur
• 6.02 x 10²³ atoms of sulfur

Which has the greatest number of molecules?

• 1 mole of methane CH₄
• 28 grams of carbon monoxide CO
• 16 grams of methane CH₄
• none of the above

How many grams are in 1.2 x 10²⁴ molecules of CO?

• 28 grams
• 56 grams
• 6.02 grams
• 1.2 grams

Which has a greater mass: 1 mole of scandium or 2 moles of boron?

• scandium
• boron
• neither
• more information is needed.

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

• 40 g
• 80 g
• 16 g
• 32 g

What is the mass in grams of 6.25 mol of copper (II) nitrate?

• 126 g
• 785 g
• 625 g
• 1172 g

Avogadro's number of representative particles is equal to one_____.

• kilogram
• gram
• kelvin
• mole