Which of the following statements is true? Chemical reactions are the same as atomic reactions. The sun uses nuclear fusion reactions to generate heat. Nuclear power can't be used to do beneficial work. Nuclear fission is more dangerous than nuclear fusion.

The sun uses nuclear fusion reactions to generate heat.

Explanation:

It is true from the given choices that the sun uses nuclear fusion reactions to generate heat.

The heat that accompanies nuclear fusion reactions is very huge. In fact this is the source of energy for the whole solar system.

During a nuclear fusion reaction, small atomic nuclei combines to form larger ones.

This combination results in a series of chain reactions that releases energy.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.