is entropy increasing or decreasing for the system? In creasing or decreasing fo
ID: 1018745 • Letter: I
Question
is entropy increasing or decreasing for the system? In creasing or decreasing for the surroundings? SaNandh Bydges Recitation Activity with Thermodynamics 1. 4NH, (g) + SO2 (g) 4 NO (g) + 6H2O (g) "-906 ku exaterC a Is entropy increasing or decreasing for the system? b. Is entropy increasing or decreasing for the surroundings? c. Is the reaction spontaneous? i. Yes ii. No ii. Sometimes 2. From each of the following pairs of substances, choose the one that has the greater entropy and justify your choice. a. Ar (g) at 280K or Ar (8) at 350K b. Co (g) at 300K or CO2 (g) at 300K 3, Predict (do not calculate) the sign of for the following reactions: a. b. c. 2K(s) + F2 (g) 2KF (s) Nacio, (s) Na, (aq) + CIO' (aq) HCl (aq) + NaOH (aa) NaC1+ H20 (1) 4. Calculate AS. , and G° for the following reaction at 298 K. Indicate if the reaction is spontaneous or not. 2H20 (g) 2H2 (g) + O2 (g)Explanation / Answer
Q1)
a) The change in number of moles of gaseous products from reactants to products is positive, hence the entropy will be positive
Change in number of gaseous mole = (4+6) - (4+5) = 1
Hence entropy is increasing for the system
b) The entropy of the surroundings will be positive
c) Yes, the reaction is always spontaneous since
Delta G = Delta H - T* Delta S
Sinec Delta H<0 and Delta S>0
Hence the sign of Delta G will also be negative in this case
Therefore, the reaction will always spontaneous
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