PRORA12. Solid Ca(HC03)2 decomposes as Ca(HCO3) 2 (s) CaCO3(s) + CO2(g) + H20(g). If the total pressure is 0.2atm at 420 K, what is the standafd free energy change for the given reaction (A-G^° )?(a) 840k/molb) 3.86 kJ/mol(c) 6.98 kJ/mol(d)16.083 kJ/mol

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C a {(H {C O}_{3})}_{2}

C a {(H {C O}_{3})}_{2} (s) ⇌ C a {C O}_{3} (s) + {C O}_{2} (g) + H_{2} O (g)

0.2

420 K

Δ_{r} G^{o}

N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g) a t 298 K .

△ H^{o} = - 92.4 k J m o l^{- 1}

△ S^{o} = - 198.3 J K^{- 1} m o l^{- 1}

298 K

2 N O (g) + B r_{2} (l) \to 2 N O B r (g)

N O

0.1 a t m

N O B r

2.0 a t m

Δ G_{f N O B r}^{0} = 82.4 k J m o l^{- 1}, Δ G_{N O}^{0} = 86.55 k J m o l^{- 1}

2.0 \times 10^{- 7}

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

Δ H^{\circ} = 28.40 k J m o l^{- 1}

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