Question

the number of moles of co2 which contain 8g of o2

Answer 1

Mass of Oxygen = 8 g

Molar mass of Oxygen =32g mol ⁻¹

Number of moles of Oxygen = 8 / 32 moles

                                             = 0.25 moles

1 mole of CO₂ will contain 1 mole of Oxygen

∴ 0.25 mole of oxygen is present in 0.25 moles of CO₂