Jenna took an open bowl of leftover mashed potatoes from the refrigerator. She determined that chemical changes occurred since the potatoes were first placed there.

Which observations most likely led to Jenna’s conclusion

maybe the potatoes took a different form? They smell different, look different taste different, etc.

Explanation:

a change of odor

Explanation:

She said it smells diffrent from last night so its odor change your welcome.

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.