ok let's try this again :) In the chemical reaction 3H2 + N2 --> 2NH3, how many moles of NH3 will be produced if 4 moles of nitrogen react?

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

i think that the answer is c