A Sealed Rigitd Tank Contains 30 Moles of an Ideal $270 \mathrm {~K}$

question 48

Multiple Choice

A sealed rigitd tank contains 30 moles of an ideal gas, at an initial temperature of $270 \mathrm {~K}$ The pressure of the gas is increased until the final pressure equals 1.40 times the initial pressure. The heat capacity at constant pressure of the gas is $32.0 \mathrm {~J} / \mathrm { mol } \cdot \mathrm { K }$ What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)

• A)77 kJ
• B)100 kJ
• C)130 kJ
• D)-50 kJ
• E)-23 kJ

---

Definitions:

Longitudinal Research

An approach in research involving repeated observations of the same variables (e.g., people) over short or long periods of time, from months to decades.

Pilot Research

An initial study conducted to test the feasibility of a project or experiment before a larger scale study is launched.

Third Variable

A factor that is not directly involved in the hypothesis being tested but may influence the relationship between the independent and dependent variables.

Reverse Causality

A situation in research or analysis where the direction of cause-and-effect is opposite to what is commonly presumed or is being investigated.