bcd 7. Which one of the following is always positive when a spontaneous process

Question

bcd 7. Which one of the following is always positive when a spontaneous process occurs: a a) AS- b) .odp c) .mod p d) .erw a b c d 8.25.0 g of a metal absorbs 370 J of heat, upon which the temperature of the sample increases from 21°C to 39 C: The specific heat of iron is: a) 0.140 b) 0.820 c)0450 d0.900 bc d 9. AS is positive for the reaction a b) CO, (s)-CO, (g) c) Ba (aq)+2 F (aq) BaF (s) d) 2Hg 1)+0, (g)-2 Hgo (s) a bcd 10. Which of the following has the greatest entropy a) Cs(s) b) Na(s) c) Li(s) d) Rb(s) bcd Which of the following combinations of signs for AH and AS will result in a reaction being spontaneous only at high temperatures a 11. a bcd 12. Which substance in the reaction below appears at the fastest rate. 4NH, + 70, 4NO, +6 H,O a) NH, b)o, c)NO, d) H2O a b c d 13. Rate data for the reaction NH,' (aq) + NO (aq) Ngg) + 2H,O (1) is given below: [NQI (M) .100 0200 0.200128 x 10" The order of the reaction with respect to NH, is: a) 0 0.200 x. b) 1 c) 2 d)-1

Explanation / Answer

the sceond law of thermodynamics states that  In all spontaneous processes, the total entropy always increases and the process is irreversible.

so DEL S(universe)>0.

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