more physics help needed. I really dont understand this.?

Eva

New member
An empty oven with a volume of 0.475 m3 and a temperature of 292 K is turned on. The oven is vented so that the air pressure inside it is always the same as that of the environment. Initially, the air pressure is 1.00x105 Pa, but after the oven has warmed up to a final temperature of 492 K, the atmospheric air pressure has decreased to 9.08x104 Pa due to a change in weather conditions. How many moles of air leave the oven while it is heating up?


A Goodyear blimp typically contains 7370 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 276 K. What is the mass (in kg) of the helium in the blimp?

A 0.0241-m3 container is initially evacuated. Then, 6.69 g of water is placed in the container, and, after some time, all of the water evaporates. If the temperature of the water vapor is 368 K, what is its pressure?
 
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