Amaterial is nonmagnetic and gaseous and does not conduct heat or electricity. it will, however, react with other elements. it is most likely a
a.) noble gas
b.) metalloid
c.) nonmetal
d.) metal

Option (C) is the correct answer.

Explanation:

When a material is non-magnetic then it means its domain or spin is not aligned in the same direction.

Whereas it is given that it does not conduct heat or electricity hence, it could be a non-metal. Also, it is given that it is gaseous and non-metals like , etc are gaseous in nature.

On the other hand, noble gases are stable and does not react easily. Also, metalloids does not exist in gaseous form.

Thus, we can conclude that a material is nonmagnetic and gaseous and does not conduct heat or electricity. It will, however, react with other elements. It is most likely a non-metal.

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.