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

4g of Nitrogen occupy 5 lit (under certain conditions)7/28 moles of Nitrogen occupy 5 lit (under certain conditions)0.25 moles of Nitrogen occupy 5lit (under certain conditions)According to Avagadro's law at same temperature and pressure 0.25 moles of 'X' also occupies 5lit under same conditions of temperature  and pressure