9. When you arrange the following substances in the onder of increasing entropy
ID: 941332 • Letter: 9
Question
9. When you arrange the following substances in the onder of increasing entropy (towest to highes) at 25"C,which is 84 in that list? HF(g), NaFs), SiFAg), SiHdg). AMs) 10. Using data tabulated below (Page 5), calculate AG at 25 C for a. -8655 J mol-1 d·This cannot be determined without additional information. b. 86.55 J mol- c. 173.10 kJ mol- e. none of these. 1 1 . Given ,"--504 kJ mol., and AS 372 J-K-1-mori, calculate the value of AG," at 358 K and determine in which direction the reaction is spontaneous at 358 K for the reaction below: UC, (s) + 4HF(g) + F, (g) UF, (s) + 2H2O(g) A) AG..- -371 kJ-mol: spontaneous in the forward direction B) 6,"-371 kJ-mor', spontaneous in the reverse direction C) AG.-637 kJ-mol; spontaneous in the reverse direction D) Gn 637 kJ-mol.": spontaneous in the forward direction E) None of these is true 12. Arrange the following reaction equations according to increasing AS values: i. CH, (g) +30, (g)2CO. (g)+2H,O(g) ii·PC, (g) PCI, (g) + Cl·(g) iii. Na(51+0, (g) Nao. (s) iv , 2 C,H,o (g) + 13 02 (g) 8 CO, (g) + 10 H:0 (g) e. None of these orders are correctExplanation / Answer
9. Option d) SiH4(g)
The order of increasing entropy is as follows...
Al(s) < NaF(s) < HF(g) < SiH4(g) < SiF4(g)
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