Find the change in S° for the formation of one mole PCl5(g)

Question

Find the change in S° for the formation of one mole PCl5(g) from its elements. (Use white phosphorus as the reactant.) (answer is in units of J/K)*change in S° of PCl5(g) = 353 change in S° of P4 (s) = 41.1change in S° of Cl= 153.25

Dr. Juanita Wolff · Accepted Answer

omg i just had this test today too!!!!!u use hess's law to find the change--->write the equation, balance it and then use the moles (coefficients) to multiply the change is s for each element.hess's law says that the change in s (or h, or G, its usable for any of the thermo concepts) is equal to the sum of the entropy of the products minus the sum of the entropy of the reactants. its pretty easy after that--just plug in the values and there you go! good luck! this was a hard test for me..so confusing.

Dr. Juanita Wolff · Answer

First the equationP + Cl = PCl5Balance itP + 5Cl = PCl5Next conform it to the change in S equations.P4 + 25Cl = 4(PCl5)Now insert the equations to find the change in S and change in S of subtract products - change in S of reactants.I forgot to say remember to reconvert you answer back to how much one mole of PCl5 is by dividing your answer by 4.

Dr. Juanita Wolff · Answer

sorry friend I forgot all concept of chemistry. if u need help in IT related field ( programing like c,c++,java,etc...),i can help u.

Dr. Katlynn Swaniawski II

Find the change in S° for the formation of one mole PCl5(g)

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