Consider the reaction NH_4NO_3(aq) rightarrow N_2O(g) + 2H_2O(l) Using the stand

Question

Consider the reaction NH_4NO_3(aq) rightarrow N_2O(g) + 2H_2O(l) Using the standard thermodynamic data in the tables linked above, calculate the equilibrium constant for this reaction at 298.15K. Consider the reaction S(s, rhombic) + 2 CO(g) rightarrow SO_2(g) + 2 C(s, graphite) Using the standard thermodynamic data in the tables linked above, calculate the equilibrium constant for this reaction at 298.15K. Consider the reaction 2N_2(g) + O_2(g) rightarrow 2N_2O(g) Using the standard thermodynamic data in the tables linked above, calculate the equilibrium constant for this reaction at 298.15K.

Explanation / Answer

Question 1.

Find K given the reaction

First, claculate dG

dG = Gproducts - Greactants

dG = dG-N2 + 2*dG-H2O - dG-NH4NO3

note that must be in their phases!

dG = (104.1816 + 2*-237.178408) - (-410.6)

dG = 40.424 kJ

dG = 40424 J

apply

dG = -RT*ln(K)

K = exp(-dG/(RT))

K = exp(-40.424/(8.31*298))

K = 0.983808

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