Which of the following will favor a spontaneous change? 1.+ΔH. 2.−ΔH. 3.+ΔS. 4.−ΔS.

Question

asked Oct 24, 2019 80.5k views

2 Answers

Hal Burgiss · Answer 1 · 2019-10-30T07:09:54+0000

Answer:
$-\Delta H and +\Delta S$ will favor a spontaneous change

Explanation:

For a spontaneous reaction,
$\Delta G$ (Change in gibbs free enegy) should be negative.

We know,
$\Delta G=\Delta H-T\Delta S$

where
$\Delta H$ is change in enthalpy for reaction, T is temperature in kelvin scale and
$\Delta S$ is change in entropy for reaction.

T is always positive. Therefore , to make
$\Delta G$ negative,
$\Delta H$ should be negative and/or
$\Delta S$ should be positive

Hence
$-\Delta H and +\Delta S$ will favor a spontaneous change.