Question

For each of these equations, predict the effects of temperature on the spontaneity of the reaction.
2N2O(g) → 2N2(g) + O2(9)
AH<0; AS > 0
A
H
A
S
AG
Spontaneity
+
+
H20(1) ► H2O(9)
AH> 0; AS >
-
+
302(9) ► 203(9)
AH >0; AS < 0
+
+ or -
nonspontaneous for
all T
spontaneous for all T
spontaneous at high
т
nonspontaneous at
low T
spontaneous at low T
nonspontaneous at
high T
C(s) + 2Cl2(g) → CCl4(9)
AH<0; AS < 0
+ or -
DONE

Answer 1

The spontaneity of a reaction depends on the temperature, enthalpy and entropy.

What is spontaneity of a reaction?

A reaction is said to be spontaneous if it can proceed on its own without a further input of energy.

In the first case, when the enthalpy is less than zero and the entropy is greater than zero, the reaction is spontaneous at all temperatures.

In the second case, when the enthalpy greater than zero and the entropy is greater than zero, the reaction needs to proceed at high temperatures to be spontaneous.

In the third case, when the enthalpy is greater than zero and the entropy is less than zero, the reaction ought to proceed at low temperature in order to be spontaneous.

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