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What does 1 mol of H2 weigh?

What does 1 mole of O2 weigh?

What does 1 mole of CO2 weigh?

If volume is in dm^3 how do you work out how many moles there are?

If volume is in cm^3 how do you work out how many moles there are?

What amount, in mol, of gas molecules is in 72cm^3 of any gas at room temperature and pressure?

What is the volume, in cm^3, of 2.13x10^-3 mole of a gas at room temperature and pressure.