Edexcel Jun 2017 (IAL) Paper 4 Q5

Answers available below

5 The decomposition of hydrogen iodide at 500 K is an equilibrium reaction. Equation 1 HI(g) (cid:85) H2(g) + I2(g) (cid:507)H 1 (cid:57) = +5 kJ mol1 Kc1 = 6103 (a) What is the effect of raising the pressure of the reaction mixture on the reaction rate, equilibrium yield and value of Kc1? (1) Rate Equilibrium yield Kc1 Increased No change No change No change No change Increased Increased Increased No change No change Increased Increased (b) The equation can also be written as Equation 2 2HI(g) (cid:85) H2(g) + (cid:57) I2(g) (cid:507)H2 Equilibrium constant = Kc2 Which combination of expressions is correct? (1) (cid:507)H 1 (cid:507)H 1 (cid:507)H 1 (cid:507)H 1 (cid:57) = (cid:507)H 2 (cid:57) = (cid:507)H 2 (cid:57) = (cid:507)H 2 (cid:57) = (cid:507)H 2 (cid:57) and Kc1 = Kc2 (cid:57) and Kc1 = Kc2 (cid:57) and Kc1 = Kc2 (cid:57) and Kc1 = Kc2 Use this space for any rough working. Anything you write in this space will gain no credit. (Total for Question 5 = 2 marks) *P48385A0428* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

Show answer