Calculate DeltaS0 for the formation of 1 mol of HI(g) from its elements given the following information:

Question

S0[H2(g)] = 131 J/mol∙K
S0[I2(s)] = 116 J/mol∙K
S0[HI(g)] = 206 J/mol∙K.

A) 82 J/K
B) 165 J/K
C) 247 J/K
D) 329 J/K

Answer 1

dSrxn = (n*dSproducts)- (n*dSreacrtants)

Answer 2

I think the answer is A, but it should be 82.5 and not 82 since you have to divide by 2 at the end to get the delta S formation of 1 mole of HI(g)

Answer 3

82.5 is right