N₂O (laughing gas) is used as an anesthetic.A dentist has a 2.00 L flask of N₂O at a pressure of 1.00 atm and a 3.00 L flask of nitrogen gas at 2.00 atm that are separated by a valve.What is the final pressure in the flasks when the valve is opened and the gases mix together? Both flasks are at the same temperature, and the temperature does not change when the gases mix.

Question

Quizplus · Accepted Answer

The total number of moles of gas is the sum of the moles of gas in each flask. The total volume of gas is the sum of the volumes of gas in each flask. The final pressure is the total number of moles of gas divided by the total volume of gas.Moles of N2O = (1.00 atm)(2.00 L) / (0.0821 Latm/molK)(298 K) = 0.0821 molMoles of N2 = (2.00 atm)(3.00 L) / (0.0821 Latm/molK)(298 K) = 0.246 molTotal moles of gas = 0.0821 mol + 0.246 mol = 0.328 molTotal volume of gas = 2.00 L + 3.00 L = 5.00 LFinal pressure = (0.328 mol) / (5.00 L) = 1.60 atm

N2O (Laughing Gas) Is Used as an Anesthetic

N₂O (Laughing Gas) Is Used as an Anesthetic