An alloy is made up of two kinds of metals. this alloy is uniform in appearance. how would this material be classified?

An alloy is an Homogenous mixture; also called solutions.  Homogenous mixture is uniform, which means its substances are evently mixed throughout the mixture. Examples are:

Clear liquids, such as vinegar, apple juice, salt water, and salad oil

alloys, such as steal, which are mixtures of metals or a metal and a nonmetal

plastics

ceramics

air

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.

i think it is true since you can test the answer and can use observations to complete it.