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Chapter 3: Q85PP (page 616)

What is one reason the noble gases are preferable to air (which is mostly nitrogen and oxygen) as an insulating material?

(a) Noble gases are monatomic, so no rotational modes contribute to their molar heat capacity

b) noble gases are monatomic, so they have lower molecular masses than do nitrogen and oxygen

(c) molecular radii in noble gases are much larger than those of gases that consist of diatomic molecules

(d) because noble gases are monatomic, they have many more degrees of freedom than do diatomic molecules, and their molar heat capacity is reduced by the number of degrees of freedom.

Short Answer

Expert verified

Nobel gases are monoatomic, so no rotational modes contribute to their molar heat capacity so option a is correct.

Step by step solution

01

Relation between thermal conductivity and its molar capacity.

The thermal conductivity k of a gas depends on its molar heat capacity CV, molar mass M, and molecular radius r. The dependence on those qualities at a given temperature.

02

The relation between thermal conductivity and molar heat capacity

The dependence on those quantities at a given temperature is

k=Cvr2M

The noble gases are preferred to air which is mostly nitrogen and oxygen as an insulating material.

Hence, Nobel gases are monoatomic, so no rotational modes contribute to their molar heat capacity.

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