A sample of helium has a volume of 2.00 liters, a temperature of 20.0 °C, and a pressure of 2.50 atmospheres. What is the energy needed to heat the sample of helium gas from 20.0 °C to 95.0 °C at constant volume?

Question

Quizplus · Accepted Answer

The energy needed can be calculated using the formula Q = nCvΔT. First, calculate the number of moles (n) using the ideal gas law PV = nRT. Then, use Cv for helium (3/2 R) and the temperature change (ΔT = 75 K) to find the energy.

A Sample of Helium Has a Volume of 2