At -5 ° C (268 K), the solid compound Y(H 2 O) 6 is in equilibrium with gaseous Y, water vapour and ice. The partial pressures of the two gases in equilibrium with a mixture of Y(H 2 O) 6 and ice are

Question

At -5 ° C (268 K), the solid compound Y(H 2 O) 6 is in equilibrium with gaseous Y, water vapour and ice. The partial pressures of the two gases in equilibrium with a mixture of Y(H 2 O) 6 and ice are 0.50 atm for Y and 0.002 atm for water vapour. The processes are: (i) Y(H 2 O) 6 (s) ⇌ Y(g) + 6H 2 O(g); K P1 (ii) Y(H 2 O) 6 (s) ⇌ Y(g) + 6H 2 O(s); K P2 Identify the correct statement(s).

TestHub · Accepted Answer

K P1 = P Y (P H2O ) 6 = (0.50)(0.002) 6 (0.002) 6 = 6.4 × 10 -17 , so K P1 = 3.2 × 10 -17 atm 7 and (a) is correct In (ii) the solids carry no pressure term, so K P2 = P Y = 0.50 atm and (b) is wrong The water vapour is in equilibrium with ice at 268 K, so 0.002 atm is the vapour pressure of ice and (c) is correct Dividing, K P1 /K P2 = (P H2O ) 6 = (0.002) 6 , so K P1 = K P2 (0.002) 6 and (d) is correct The correct statements are (a), (c) and (d).

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