Can someone please answer question 13 and 19.

The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. 2SO2(g)+O2(g)=2SO3(g)SO3(g)=1/2O2(g)+SO2(g)KC=1.7106KC=? A) 1.2106 B) 8.5 C) 7.7104 D) 1.3103 E) 3.4102 Use the Hf and Hrxn information provided to calculate Hf for SO3(g) : Hf(kJ/mol2SO3(g)SO3(g)+O2(g)2Hrxn=198kJSO2(g)297 A) 578kJ/mol B) 495kJ/mol C) 792kJ/mol D) 396kJ/mol E) 248kJ/mol