CHM152: Practice with Equilibrium Calculations 1) For the reaction N 2 (g) + O 2 (g) ↔ 2NO(g) at 2000°C, K c = 4.10 x 10-4 at 2000°C. If 0.20 mol of N 2 and 0.15 mol of O 2 are placed in a 1L vessel at 2000°C, what will be the concentrations of NO, O 2 , and N 2 at equilibrium? 2) For the reaction 2HBr (g) ↔ H 2 (g) + Br 2 (g) at 425°C, K p = 4.18 x 10-9 . If 0.20 atm of HBr(g), 0.010 atm of H 2 (g), and 0.10 atm of Br 2 (g) are introduced into a container, will the mixture be at equilibrium? 3) For the reaction CaCO 3 (s) ↔ CaO(s) + CO 2 (g) at 800°C, K p = 1.16. If 20g of CaCO 3 were put into a 10.0L container and heated to 800°C, what percentage of the CaCO 3 would remain in the container at equilibrium? 4) For the reaction NH 4 HS(s) ↔ NH 3 (g) + H 2 S(g), K c = 1.2 x 10-4 at 491K. What mass of NH 3 will be present at equilibrium if a sample of NH 4 HS is placed in a vessel at 491K? 5)
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