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moles of Z = gas volume of Z / volume of 1 mole. moles = V (dm3) / 24 (at RTP) The latter form of the equation can be used to calculate molecular mass from experimental data because. moles = mass / molecular mass = gas volume / volume of 1 mole. mass / molecular mass = gas volume / volume of 1 mole. molecular mass = mass x volume of 1 mole/volume. bocoran rtp live slot