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# Thermochemical Stoicheometry

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### Thermochemical Stoicheometry

1. 1. Thermochemical Stoicheometry Thermochemical Stoicheometry Thermochemical stoicheometry is stoicheometry problems with the energy factor involved. Thermochemical Equations are balanced equations with the energy exchange indicated either within the equation or as a Delta H term on the outside of the equation. For example: 2 Na + 2 H2O(l) -----> 2 NaOH(aq) + H2(g) Delta H = -367.5 kj An alternative way of showing the equation would be: 2 Na + 2 H2O -----> 2 NaOH(aq) + H2 (g) + 367.5 Kj Using the coefficients and the Delta H one can form mole Kj relationships for each component found in the balanced equation. The above thermochemical equation could use any one of the following mole Kj relationships: 2 moles Na = -367.5 2 moles H2O = -367.5 Kj 2 moles NaOH = -367.5 Kj 1 mole H2 = -367.5 Kj Let's use the above thermochemical equation for an example of a thermochemical stoicheometry problem: How much energy will be produced if 18 moles Na are reacted with enough water to consume all the the Na? 1. Determine the mole Kj relationship for the given component using the balanced equation: 2 moles Na = -367.5 Kj http://members.aol.com/profchm/tstoic.html (1 of 3)14/09/2006 15.30.36