A balloon vendor at a street fair is using a tank of helium to inflate the balloons. The tank has a volume of 75 L and a pressure of 95 atm at 22°C. The valve is not closed completely and some helium leaks out. After some time, the pressure drops to 85 atm. How many moles of helium have been lost?

Question

Quizplus · Accepted Answer

Using the ideal gas law, PV = nRT, we can calculate the initial and final moles of helium and find the difference. The initial moles are approximately 292 mol, and the final moles are approximately 261 mol, so about 31 mol of helium have been lost.

A Balloon Vendor at a Street Fair Is Using a Tank