Asample of ni3 is contained in a piston and cylinder. the samples rapidly decomposes to form nitrogen gas and iodine gas, and releases 3.30 kj of heat and does
950 j of work. what is δe?

ΔE is -4250 J

Explanation:

Step1: Data given

3.30 kJ of heat is released

There is 950 J of work done

Step 2: Calculate ΔE

ΔE = q + w  

 ⇒ with q = heat of energy released = 3.3 kJ = 3300 J ( negative because the heat is released)

⇒ work done = 950 J ( also negative )

ΔE = -3300J-950J= -4250 J

ΔE is -4250 J

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.