Is a state matter that does not have a definite shape or volume, will expand to fill the shape and volume of its container

the answer is gas

Explanation:

you could really use process of elimination solids have definite volume and definite shape , liquids have definite volume but takes the shape of its container , and then gas is left as an answer choice

-be a crystalline solid

- be soluble in water

-conduct electricity

hope this : )

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.