Some one pls help and don't answer for the points I really need help how did climate and geography affect the settlers of ancient Greece

O their economy struggled because the location made trading difficult
O they built homes into mountainsides to keep homes cooler in the summer
O their economy struggled due to the lack farmland and fishing grounds
O they raised animals in the mountains and grew crops on the coasts

A their economy struggled because the location made trading difficult

Explanation:

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.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)