How many moles are in 3.4 x 10^24 atoms of nitrogen ?

1 mole = 6.022 x 1023 particles, molecules, etc.

Hope this helps

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.