Enthalpy Change?

Question

Ammonia burns in the presence of oxygen gas and a copper catalyst to form nitrogen gas and water vapor.

4NH3(g) + 3O2(g) -------> 2N2(g) + 6H2O(g) dH=-1267kJ

What is the enthalpy change(in terms of kJ) to burn 35.8g of ammonia?

(answer should be reported to 3 sig figs )
Format: +/-XXX

** BEST ANSWER TO THE ONE WHO GETS IT RIGHT **

Answer 1

35.8 g NH3 x (mol / 17 g) x (-1267 kJ/mol) = -2670 kJ