Question

Part 1.)

A certain reaction has H^o = -26.10 kJ and S^o = 15.60 J/K.



(a) Is this reaction exothermic, endothermic or isothermic (neither)?

This reaction is  ---Select--- exothermic endothermic or isothermic .



(b) Does this reaction lead to a decrease, an increase, or no change in the degree of disorder in the system?

This reaction leads to  ---Select--- a decrease, an increase, or no change in the disorder of the system.



(c) Calculate G^o for this reaction at 298 K. If this value is less than 1 kJ/mol then enter 0 in the answer box.

G^o =  kJ.



(d) Is this reaction spontaneous, nonspontaneous, or near equilibrium under standard conditions at 298 K?

This reaction is  ---Select--- spontaneous, nonspontaneous, or near equilibrium under these conditions.

Part 2.)

Complete the following table by calculating the missing entries. In each case indicate whether the solution is acidic or basic.

pH	pOH	[H+]	[OH -]	acidic or basic?
3.64		M	M	acidicbasic
	10.58	M	M	acidicbasic
		4.90 x 10-5 M	M	acidicbasic
		M	7.80 x 10-11 M	acidicbasic

Part 3.)

When a 1.48-g sample of solid ammonium nitrate dissolves in 56.4 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 22.00 ^oC to 20.09 ^oC. Calculate H in kJ/mol NH₄NO₃ for the solution process. NH₄NO₃(s) NH₄⁺(aq) + NO₃^-(aq) The specific heat of water is 4.18 J/g-K.

H_solution = ______ kJ/mol NH₄NO₃.

Answer 1

(9) reaction has DH = -26. 1 kJ and A5=15.8k. here since A40 (change in enthalpy) is negative onears that the chergy is released from system and heat is released to reaction is Exothermic (b) Disorder means that degreee a randonners which is predicted by AS Change in entropy. Here D = 15.65/1 which is the means Cuhopy it is increased so die order will Increase ( we have a relation that is sGo = 04² -TAS 04 =- 26. loks T=290k A5 = 15.6J/k 0.0156 kJ/k. [ loooJ = 1kJ) now but allvalues. DS® –26.10 - 298 X(0.0156) 1DG = - 30.75 kJ (a Here D9 = - 30.75 which is negative value means Bato and for condition AGLO Reaction become spontaneous. so Reaction is spontaneous at 298 R.