How Much Energy,in KJ,is Required to Ionize 2

How much energy,in kJ,is required to ionize 2.78 moles of hydrogen atoms?

A) 2.74 × 10³ kJ
B) 4.72 × 10³ kJ
C) 1.66 × 10³ kJ
D) 3.65 × 10³ kJ
E) 5.89 × 10³ kJ