What amount of energy is required to completely ionize 21.2 grams of carbon atoms in the gas phase (C(g))...?

Question

if the ionization energy of C(g) is 1086 kJ/mole?

Answer in units of J.

I got 1.76519567 for how many moles in 21.2g.

What next?

I thought multipling it by 1086 would work...

(getting 1917 rounded up)

but it's wrong

I also tried changing it to 1.917...

but it didn't work either.

What am I doing wrong?

Answer 1

Boring book-keeping, I'm afraid. But don't let them fool you into thinking it's difficult.

You know the energy for one mole of C. So find out how many moles there are in 21.2 g and take it from there.

Oh, and remember to go from kJ to J, because they asked you to. Best to give your answer in scientific notation and to just 3 sig figs.