QUESTIONS Two identical containers are filled with two different gases with equal moles; one of them is filled with Nz and the other one is filled with an unknown gas, and kept under vacuum conditions. When both containers are opened with identical holes, the pressure of the container which is filled with Nz dropped to 0.3 of its initial pressure within 50 seconds, whereas the pressure of the container which is filled with unknown gas dropped to 0.7 of its initial pressure within 45 seconds. Find molecular weight of the unknown gas. Assume N: 14.007 g mol- QUESTION 10 3 moles of water vapor at 110 C was heated to 140 C in a constant volume container, and the pressure of water vapor in the final conditions was calculated to be 1 atm. Then, the container was changed to a constant pressure container (external pressure = 1 atm) and the volume of the gas was increacsed to 2 -fold under these conditions without any heat exchange. What is the change in the internal energy of the system. (For water vapor c = 2.01 Jg-K-'). 1H: 1.008 g mol-'; 80: 16.00 g mol