What type of weather does high air pressure bring

Good, sunny weather, Clear skies

Explanation: In high pressure systems cooler air in the troposphere is pushed down by warmer air. The air temperature in the troposphere is low so warm air cools down. This causes a higher air pressure with makes the humidity low. Since the molecules of air are closer to each other there is no enough space for water vapor to occupy making humidity low. Since less amount of water vapor then lower possibilities of cloud formations.

oh it is true if thats what you are asking

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.