9.3: Gibbs Free Energy and Thermodynamic Favorability

Multiple Choice

Given the following information, calculate ΔG⁰ for the reaction below at 25⁰C: (K = ⁰C + 273)

SnCl₄(l) + 2 H₂0(l) → SnO₂(S) + 4HCl(g),

ΔH⁰=+133.0 kJ and ΔS⁰ =+401.5 J/K

• -252.6 kJ

• -13.4 kJ

• 13.4 kJ

• 252.6 kJ

Multiple Choice

Your enthalpy is +20 and your entropy is +5. Which temperature will give a spontaneous reaction?

• 0

• 4

• 8

Multiple Choice

For the process at 25⁰C : I₂(g) →I₂(s). What are the signs for ΔG, ΔH and ΔS?

• ΔG + ΔH - ΔS -

• ΔG - ΔH - ΔS -

• ΔG - ΔH + ΔS +

• ΔG - ΔH + ΔS +