9-1 The Mole

Multiple Choice

What is the significance of the mole in chemistry?

• It measures mass

• It measures volume

• It is a counting unit

• It measures temperature

Multiple Choice

Which of the following statements is true about N₂O?

• The molecular mass is 30.

• One molecule of N₂O consists of one nitrogen atom and one oxygen atom.

• One mole of N₂O contains 6.02 x 10²³ atoms of nitrogen.

• One mole of N₂O consists of two moles of nitrogen atoms and one mole of oxygen atoms.

Multiple Choice

What is the formula to convert from moles to the number of particles?

• moles × (6.02 × 10^23 particles/mol)

• moles ÷ (6.02 × 10^23 particles/mol)

• moles + (6.02 × 10^23 particles/mol)

• moles - (6.02 × 10^23 particles/mol)

Multiple Choice

Which of the following dimensional analysis setups will correctly convert 4.00x10²³atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

• setup B : 0.6644mol Co
• setup A: 2.41x10⁴⁷mol Co
• setup A : 0.664mol Co
• setup B: 2.41x10⁴⁷mol Co