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Reactivity Calculations: Free Energy Practice Exercises

Practice calculating ΔH, ΔS, and ΔG for various chemical reactions. Determine spontaneity at different temperatures using free energy data.

hyacinth-everett
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Reactivity Calculations: Free Energy Practice Exercises

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  1. Free Energy Practice 5 • For the reaction shown below: • 2 SO2(g) + O2(g) → 2 SO3(g) • Calculate ΔH & ΔS, and ΔG at 25oC. • Is this reaction spontaneous?

  2. Free Energy Practice 6 • In “Hess’s Law Practice 2”, you calculated that ΔH is positive for the conversion of carbon from graphite to diamond, indicating an endothermic reaction. Perform the same analysis, but this time use the free energy data, in place of the enthalpy data. Is this process spontaneous at 25.0 oC? How do you know? • Cgraph(s) → Cdiam(s), • Cgraph(s) + O2(g) → CO2(g) • Cdiam(s) + O2(g) → CO2 (g)

  3. Free Energy Practice 7 • Methanol (CH3OH) is a fuel used in high-performance racing engines. Calculate ΔG for the combustion of methanol at: • CH3OH(g) + O2(g) → CO2(g) + H2O(g) • Make sure it is balanced! • 25.0 oC (the value assumed on the data table) • 90 oC

  4. Free Energy Practice 8 • A chemical engineer wants to determine the feasibility of producing ethanol (C2H5OH) by a synthesis reaction between liquid water and ethylene (C2H4). Is this reaction spontaneous under standard conditions (of 25oC, the value from the chart)?

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