An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas during this process? (R = 8.31 J/mol ∙ K)
A) 1280 J
B) 792 J
C) 685 J
D) 1370 J
E) 1700 J

Question

Quizplus · Accepted Answer

The correct answer is A.The heat gained by the gas during this process can be calculated using the formula:Q = nRTln(Pf/Pi)where:n is the number of moles of gasR is the ideal gas constantT is the temperature of the gasPf is the final pressure of the gasPi is the initial pressure of the gasSubstituting the given values into the formula, we get:Q = (2.30 mol)(8.31 J/mol ∙ K)(298 K)ln(350 kPa/770 kPa) = 1280 JTherefore, the heat gained by the gas during this process is 1280 J.

An Expandable Container Holds 2