34. Without doing any calculations, determine the sign of ? S sys and ? S surr f

Question

34. Without doing any calculations, determine the sign of ?Ssys and ?Ssurr for each chemical reaction. In addition, predict under what temperatures (all temperatures, low temperatures, or high temperatures), if any, the reaction will be spontaneous.

a.    2 CO(g) + O2(g) ? 2 CO2(g)              ?Hrxn= ? 566.0 kJ

b.    2 NO2(g) ? 2 NO(g) + O2(g)                       ?Hrxn= + 113.1 kJ

c.     2 H2(g) + O2(g) ? 2 H2O(g)              ?Hrxn= ? 483.6 kJ

d.    CO2(g) ? C(s) + O2(g)                     ?Hrxn= + 393.5 kJ

Explanation / Answer

for any spontaneous reaction delta G must be negative

?G=?H-T?S

1)?S CAN BE +VE OR -VE

2).?S CAN ONLY BE +VE

3).?S CAN BE BOTH +VE AND -VE

4).?S CAN ONLY BE +VE

1).for -ve ?s low temp is favourable & low temp for +ve

2).high tempreture is favourable

3).for -ve ?s low temp is favourable & low temp for +ve

4).high tempreture is favourable

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