Help with chemistry please?

Question

Calculate G° for each reaction using G°f.

(a) MnO2(s) + 2 CO(g) ~> Mn(s) + 2 CO2(g)
______ kJ
(b) H2(g) + I2(s) 2 HI(g)
_____kJ
(c) NH4Cl(s) ~> NH3(g) + HCl(g)
_____ kJ

Answer 1

Delta G for any reaction is the sum of the DGf of the products - DGf of the reactants. You'll look up those standard free energies of formation in a table in your text or in the CRC Handbook.