I need some help with a CHEM 12 problem

Question

I really don't understand how to do this question, any help would be greatly appreciated!!

Nitrogen monoxide and oxygen gas react to produce nitrogen dioxide according to the following balanced chemical equation:

2 NO(g) + O2(g) ––––––––––> 2 NO2(g) + 114.0 kJ

Calculate the amount of heat released in kJ when 14.50 grams of NO is reacted with excess oxygen gas. The molar mass of NO = 30.0 grams/mole.

Answer 1

2 NO(g) + O2(g) ==> 2 NO2(g) + 114.0 kJ

From the balanced equation we see that combustion of 2 moles of NO generates 114.0 kJ of heat energy.

So, if we can determine how many moles of NO we have in 14.50 g, we can find the kJ of heat energy.

moles of NO present = 14.50 g NO x 1 mol NO/30.0 g = 0.4833 moles NO

Heat generated = 0.4833 moles NO x 114.0 kJ/2 moles = 27.55 kJ (4 sig. figs) = 27.6 kJ (3 sig.figs. based on molar mass used of 30.0 g/mol)