i need help on this

Question

 Does the amount of energy released or absorbed by the system increase or decrease as the amount of CaCl2 is increased (from reaction 1 to reaction 2)? Explain.

Answer 1

It wouldn't depend on the the CaCl₂ quantity it would depend on the system it self.

In any reaction;

Reactant → Product ± Energy

and the amount of energy released would be determined by the Change in Gibbs free energy.

If ΔG>0 it's endothermic and if ΔG<0 it's exothermic.

ΔH is the change in enthalpy, which is calculated from the Σ(Product_{Heat of formation}-Reactant_{Heat of formation})

ΔS is the Change in Entropy, again calculated from table values in a Σ(products-reactants) form.

The heart of your question is does adding CaCl₂ to a reaction change the amount of energy in the system, of course! but depending on the free energy of the system, the entire system may require more energy or give off more energy!