Carbon dioxide is passed over hot coke: C(s) + CO₂(g) ⇌ 2 CO(g), with Kp = 2.4 bar at the temperature used. The gas is held in a cylinder whose piston keeps the total pressure at 2.00 bar, and some coke is left at equilibrium. What is the percentage of carbon monoxide in the gas at equilibrium, by moles? Give it to the nearest integer.

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Carbon dioxide is passed over hot coke: $\text{C}(s) + \text{CO}_2(g) \rightleftharpoons 2\,\text{CO}(g)$ , with $K_p = 2.4\ \text{bar}$ at the temperature used. The gas is held in a cylinder whose piston keeps the total pressure at $2.00\ \text{bar}$ , and some coke is left at equilibrium. What is the percentage of carbon monoxide in the gas at equilibrium, by moles? Give it to the nearest integer.

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← For NH₄HS(s) ⇌ NH₃(g) + H₂S(g), Kp = 0.11 bar² at 298 K. A rigid flask at 298 K holds ammonia at a pressure of 0.40 bar. Plenty of solid NH₄HS is put in, so that some solid is left at equilibrium. What is the total pressure in the flask at equilibrium?One litre of a buffer holds 0.30 mol of ammonia and 0.20 mol of ammonium chloride at 298 K. Then 0.050 mol of solid sodium hydroxide is dissolved in it, with no change in volume. What is the pH of the buffer now? Take pKb(NH₃) = 4.75, log 3 = 0.477 and log 7 = 0.845. →

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