Answer to Question #229108 in General Chemistry for Mickayla Ennis

Question

You are given pure samples of ammonia, NH₃(g), and nitrogen trifluoride, NF₃(g). What prediction would you make concerning their standard molar entropies at 298 K?

1. S°_ammonia > S°_{nitrogen trifluoride}
2. S°_ammonia< S°_{nitrogen trifluoride}
3. S°_{ammonia ≈}S°_{nitrogen trifluoride}
4. More information is needed to make reasonable predictions.

Answer 1

Answer:

The molar entropy of $NF_{3(g)}$ is greater than $NH_{3(g)}$.

Option 2 correct.

Explanation:

The standard entropy is mass dependent and standard molar entropy increases with increase in molar mass.