Question

The number of moles of co2 which contain 8.0g of oxcygen

Answer 1

Mass of Oxygen 8 g

Molar mass of Oxygen 32g mol

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