[nlb149]

1. A compressed cylinder of gas contains of N2 gas at a pressure of Pa and a temperature of 19.4°C. What volume of gas has been released into the atmosphere if the final pressure in the cylinder is Pa? Assume ideal behavior and that the gas temperature is unchanged.

2. A typical diver inhales 0.500 liters of air per breath and carries a 20.-L breathing tank containing air at a pressure of 300. bar. As she dives deeper, the pressure increases by 1 bar for every 10.08 m. How many breaths can the diver take from this tank at a depth of 25 m? Assume that the temperature remains constant.

3. Devise a temperature scale, abbreviated G, for which the magnitude of the ideal gas constant is 3.14 J/G mole

The only thing I can come up with for 1 is use PV = nRT to find V1 and V2 and take the difference. I have no guesses on the other two.

[kunjal8015]

what is the value of Pa in the first question?
initial value and final?

because you can take
p₁v₁=p₂v₂

in your case v₂ is what we are trying to find we don't user temperature because it's constant.

[MrTeo]

what is the value of Pa in the first question?
initial value and final?

because you can take
p₁v₁=p₂v₂

in your case v₂ is what we are trying to find we don't user temperature because it's constant.

You can't use that as the number of moles changes.
Consider that (as temperature is constant and the volume of the cylinder doesn't change):