Question

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

Answer 1

it is going to be 5.-s

Answer 2

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.