a 100 W electric heater operates for 10 minutes to hear the gas in a cylinder. At the same time, the gas expands from 1 L to 14 L against a constant atmospheric pressure of 4.246 atm. What is the change in internal energy in Joules of the gas?

Answer 1

dE = q+w
q = 100 watts for 10 minutes converted to joules.
work is pdV. p is 1 atm and dV is 14L so work is 14 L*atm. Convert that to joules by 14 L*atm x 101.325 = ?J. Since this is work done by the system make it a negative number so it becomes
dE = q + (-)1*14*101.325 = xJ.

Answer 2

Watch for the typo. I typed in 1 atm for pressure but the problem states 4.246 atm Sorry 'bout that.