The ionisation energy of H is 1312 kj per mol.How much energy is required to ionise 100 gm atoms of hydrogen Share with your friends Share 4 Akanksha C. answered this Dear Student,Ionisation energy for 1 mole of hydrogen atom = 1312 KJ1 mole of hydrogen atom =1.008 gIonisation energy for 1.008 g of hydrogen atom = 1312 KJIonisation energy for 100 g of hydrogen atom = 1312 KJ1.008×100 =130158.78 KJ =1.30158 ×105 Kj -5 View Full Answer