7g of nitrogen occupies a volume of 5 litres under certain conditions. under the same conditions one mole of a gas, having molecular weight 56, occupies a volume of? (ans : 20L)

1. Number of moles of N2728=0.25 moles 
2. 0.25 moles occupy 5L of volume.
  1 mole of gas occupies 50.25 = 20L

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