Calorimetry Question

[vg19]

Hi,

One mole of nitrogen and one mole of hydrogen are reacted together in a calorimeter oh heat capcity 20kJ/K. (Look carefully at these units) Calculate the change in temperature which the calorimeter will undergo.

I was thinking this was a limiting reageant question and set up the equation

N2(g) + 3H2(g) --> 2NH3(g)

But the only problem is the question said we started off with one mole of each.

Please advise me on what to do

Thanks