For S of the syste column. each system listed in the first colunn of the table b
ID: 229396 • Letter: F
Question
For S of the syste column. each system listed in the first colunn of the table below, decide (if possible) whether the change descnibed in the second column will Increase the entropy em, decrease S, or leave S unchanged. If you don't have enough information to decide, check the "not enough information" button in the last System Change The nitrogen is compressed from a volume of 12.0 L to a volume of | O S- A few moles of nitrogen (N) gas. 7.0 t while the temperature is heldO AS constant at-10.0°C O not enough information The helium, is heated from-190c to 12.0 °C and also expands from a volume of 8.0 L to a volume of 3.0 L | 0 s-o A few moles of helium (He) gas mot enough A few grams of liquid ammenia (NH). The ammonia evaporates at a constant temperature of 47.0 oC. S > 0 not enough informationExplanation / Answer
Entropy may be defined as the measure of randomness, if the randomness is more then entropy of the system is also more. Randomness of the system depends on volume of the system available for molecules and kinetic energy of the molecules. If the volume and kinetic energy of the molecules are more then randomness of the system is also more, hence the system will have more entropy.
Part A
In this case volume of the system is decreased from 12.0 L to 7.0 L so enetropy of the system will be decreased.
Hence delta S < 0
Part B
In this case temperature of the system increases so kinetic energy of the atoms also increases. Volume of the system also increases from 8.0 L to 13.0 L. Hence enetropy of the system increases.
Hence delta S > 0
Part C
Gases molecules have more randomness than liquid molecules. So gases have more entropy than liquids.
In this case liquid ammonia molecules are evaporated so entropy of the system increases.
Hence delta S > 0
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