Which of the following compounds is not appreciably

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15. Which of the following compounds is NOT appreciably soluble in water but is soluble in dilute hydrochloric acid? (A) Mg(OH) 2(s) (B) (NH 4 ) 2 CO 3(s) (C) CuSO 4(s) (D) (NH 4 ) 2 SO 4(s) (E) Sr(NO 3 ) 2(s) Answer: A 16. Gases W and X react in a closed, rigid vessel to form Y and Z according to the equation: W + X Y + Z. The initial pressure of W is 1.20 atm and that of X is 1.60 atm. No Y or Z is initially present. The experiment is carried out at constant temperature. What is the partial pressure of Z when the partial pressure of W has decreased to 1.0 atm. 17. At a certain temperature, the value of the equilibrium constant, K, for the reaction: H 2 (g) + Br 2 (g) 2HBr(g) is 2.0 X 10 5 . What is the value of K for the reverse reaction at the same temperature?
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18. In a saturated solution of Zn(OH) 2 at 25 o C, the value of [OH - ] is 2.0 X 10 -6 M. What is the value of the solubility-product constant, K sp , for Zn(OH) 2 at 25 o C? 19. HCO 3 - (aq) + OH - (aq) H 2 O(l) + CO 3 2- (aq) ∆H = -41.4 kJ When the reaction represented by the equation above is at equilibrium at 1 atm and 25 o C, the ratio [CO 3 2- ] /[HCO 3 - ] can be increased by doing which of the following? (a) decreasing the temperature (b) adding acid (c) adding a catalyst (d) diluting the solution with distilled water (e) bubbling neon gas through the solution Answer: A
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