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Internal Energy | 22 mins | 0 completed | Learn |
Calorimetry | 39 mins | 0 completed | Learn |
Thermochemical Equation | 6 mins | 0 completed | Learn Summary |
Hess's Law | 17 mins | 0 completed | Learn |
Enthalpy of Formation | 13 mins | 0 completed | Learn Summary |
End of Chapter 6 Problems | 52 mins | 0 completed | Learn |
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Units of Energy |
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Endothermic & Exothermic Reactions |
Enthalpy |
Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. Using equations from the list below, determine ΔH for
C(diamond) ⟶ C(graphite)
(1) C(diamond) + O2(g) ⟶ CO2(g) ΔH = −395.4 kJ
(2) 2CO2(g) ⟶ 2CO(g) + O2(g) Δ H = 566.0 kJ
(3) C(graphite) + O2(g) ⟶ CO2(g) Δ H = −393.5 kJ
(4) 2CO(g) ⟶ C(graphite) + CO2(g) ΔH = −172.5 kJ
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