Question

How many molecules are there in 8 g of oxygen (O₂)?

Options

• 3.011 × 10²³

• 1.505 × 10²³

• 12.044 × 10²³

• 1.505 × 10²²

Answer 1

1.505 × 10²³

Explanation:

Molar mass of O₂ = 32 g/mol

Moles = `8/32` = 0.25 moles

Molecules = 0.25 × 6.022 × 10²³ = 1.505 × 10²³