Given the equations below, what is the total enthalpy change for the formation of phosphorus pentachloride, pcl5, when phosphorus is burned in excess chlorine?

p4(s) + 6cl2(g) → 4pcl3(g), ∆h = –1224 kj

4pcl3(g) + 4cl2(g) → 4pcl5(g), ∆h = –372 kj

p4(s) + 10cl2(g) → 4pcl5(g)

a.852 kj
b.–852 kj
c.–1596 kj
d.1596 kj

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.