City University of New York 21)Which of the following systems are at equilibrium
ID: 1044233 • Letter: C
Question
City University of New York 21)Which of the following systems are at equilibrium at 298K a. 100 mL of an 1M aqueous HF solution 100 mL of an 1M aqueous KOH solution 10 g of ice added to 100 mL of water All of these systems are at equilibrium at 298K. This reaction is spontaneous at all other temperatures c. d. e. 10 g of solid NaCl added to 100 mL of H20 22)If the reaction 2A(8) Az(a) is at equilibrium at600K which of the following is true? a. b>The reaction as written is spontaneous at 200K c. The reaction as written is spontaneous at 400K d. The reverse reaction is spontaneous at 300K e. The reverse reaction goes to completion at 300KExplanation / Answer
2. The ionisation constant of HF at 298 K is 6.8* 10^-4 ,which indicates that at 298K the HF dissociated as ions in very little amount. Hence undissociated HF molecules also exist at 298K .Hence HF is in equilibrium at 198K
Answer : a
2. From the given reaction , the reaction is in equilibrium at 300°c means that below which (I.e. at 200k) it is Not in equilibrium ,henCe the reaction may spontaneous at below 200k . I.e. the reaction has higher entropy at 200k .But for equilibrium , the entropy would-be zero.
Answer : b