Imagine a reaction A for which the values of ΔH and ΔS are both negative. It is known that the absolute value of ΔS is 3 times smaller than the absolute value of ΔH. For what values of T does reaction A occur spontaneously?
We know that a reaction occurs spontaneously when ΔG<0 and that ΔG=ΔH-TΔS. So, we know that the reaction will be spontaneous when ΔH<TΔS.Its is given that ΔH and ΔS are <0 and that |ΔH|=3*|S|. From this we can conclude that the inequation ΔH<TΔS will be true whenT< 3K. We also have to keep in mind that the temperature can never be lower than the absolute zero (0K) and so, the answer is 0K < T < 3K.
AC
Related Chemistry A Level answers
All answers ▸A chemist mixes together 0.450 mol N2 with 0.450 mol H2 in a sealed container. The mixture is heated and allowed to reach equilibrium. At equilibrium, the mixture contains 0.400 mol N2 and the total pressure is 500 kPa. Calculate Kp.
How do you draw an alkene stereoisomer?
Describe the features of a benzene ring that define its reactivity. How does phenol differ from this?
Describe how collision theory explains an increase in the rate of a reaction at higher temperatures.