C 1323 kj d 1367 kj e 1411 kj answer e 14 when solid

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(C) –1,323 kJ (D) –1,367 kJ (E) –1,411 kJ Answer: E 14. When solid ammonium chloride, NH 4 Cl (s) , is added to water at 25 o C, it dissolves and the temperature of the solution decreases. Which of the following is true for the values of H and S for the dissolving process? H S (A) Positive Positive (B) Positive Negative (C) Positive Equal to Zero (D) Negative Positive (E) Negative Negative Answer: A 15.) ) ( 6 6 ) ( 2 2 3 g g H C H C What is the standard enthalpy change, Δ H o , for the reaction represented above? ( Δ H o f of C 2 H 2(g) is 230 kJ mol -1 ) and ( Δ H o f of C 6 H 6(g) is 83 kJ mol -1 ). 16.) When solid NH 4 SCN is mixed with solid Ba(OH) 2 in a closed container, the temperature drops and a gas is produced. Which of the following indicates the correct signs for ∆G, ∆H, and ∆S for the process? ∆G ∆H ∆S 17.) X(s) X(l) Which of the following is true of any substance undergoing the process represented above at its normal boiling point?
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