EBK PHYSICAL CHEMISTRY
EBK PHYSICAL CHEMISTRY
2nd Edition
ISBN: 8220100477560
Author: Ball
Publisher: Cengage Learning US
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Chapter 17, Problem 17.12E

If the n i values are all the same, a shorthand way of indicating a combination is C ( x , y ) , which is read, “How many combinations are there of x distinguishable objects separated into systems, each of which have y things?” Evaluate (a) C ( 10 , 2 ) (b) C ( 3 , 1 ) (c) C ( 6 , 3 ) (d) C ( 6 , 2 ) . (Hint:You should determine the number of systems you need for each case first.)

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Q2. Consider the hydrogenation of ethylene C2H4 + H2 = C2H6 The heats of combustion and molar entropies for the three gases at 298 K are given by: C2H4 C2H6 H2 AH comb/kJ mol‍¹ -1395 -1550 -243 Sº / J K¹ mol-1 220.7 230.4 131.1 The average heat capacity change, ACP, for the reaction over the temperature range 298-1000 K is 10.9 J K¹ mol¹. Using these data, determine: (a) the standard enthalpy change at 800 K (b) the standard entropy change at 800 K (c) the equilibrium constant at 800 K.

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EBK PHYSICAL CHEMISTRY

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