City University of New York Level3 and 4 Questions 21)Which of the following sys
ID: 1044234 • Letter: C
Question
City University of New York Level3 and 4 Questions 21)Which of the following systems are at equilibrium at 298K (a) 100 mL ofan 1M aqueous HF solution 100 mL of an 1M aqueous KOH solution c. 10 g of ice added to 100 mL of water d. 10 g of solid NaCI added to 100 mL of H20 e. All of these systems are at equilibrium at 298K 22)If the reaction 2A(g) A2(g) is at equilibrium at 300Kwhich of the following is true? a. This reaction is spontaneous at all other temperatures > The reaction as written is spontaneous at 200K The reaction as written is spontaneous at 400K The reverse reaction is spontaneous at 300K The reverse reaction goes to completion at 300K c. d. e.Explanation / Answer
21)Unlike other hydrohalic acids, such as hydrochloric acid, hydrogen fluoride is only a weak acid
in dilute aqueous solution. HF undergoes partial ionisation and exist an equilibrium
in-between unionised HF and ionised H+ and F-;
HF <---> H+ + F-
Therefore; Answer: a 100 ML of an 1 M aqueous HF solution
22)
given 2A(g) gives A2(g)
As the conversion of atoms to molecule is an exothermic process
so ,on decreasing teperature the equilibrium will try to increase temperature by moving reaction to forward
so that process reach equilibrium . according to L chattiers principle
forward reaction increase temperature as exothermic .
so answer option b is correct .The reaction as written is spontaneous at 200k .