In an experiment, 0.300 g of a vapourised liquid was found to have a volume of 84.0 cm3 at 97°C and at a pressure of 105 kPa. Calculate the relative molecular mass of the vapour.

  1. In an experiment, 0.300 g of a vapourised liquid was found to have a volume of 84.0 cm3 at 97∞C and at a pressure of 105 kPa. Calculate the relative molecular mass of the vapour.
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if you use the equation n=pV/RT and convert all the units so 84.0cm3 / 1,000,000 gives 8.4x10-5m3 and 97°C + 273 = 370K and 105kPa x 1000 = 105,000Pa. put those in the equation and once you get an answer divide 0.300g by that answer to get the relative molecular mass.