Tank of pressurized air to loosen bolts

[yassine]

Car mechanics use compressed air tools to open bolts. Instead of using an air compressor one can also use a tank of pressurized air. There is an air tank with a volume of 50 L to work with. The pressure of the tank is 50 bars when it is stored indoors at 20 °C. The bolt wrench needs at least 10 bar pressure to operate. How long can the mechanics use the bolt wrench outdoors at -20 °C if it consumes 200 L/min of air at normal pressure? The normal pressure is 1.0 bar

 

[Greg Bernhardt]

Please show what your have tried

 

[yassine]

i haven't tried anything yet i found this on a entrance exam to a university and I've been stuck on it for a while

 

[Greg Bernhardt]

i haven't tried anything yet i found this on a entrance exam to a university and I've been stuck on it for a while

What part are you stuck on? You must show some effort.

 

[yassine]

What part are you stuck on? You must show some effort.

i tried to use P(delta)V=nR(delta)T to calculate the change in pressure but since the problem lacks on n i can't do that

 

[Chestermiller]

i tried to use P(delta)V=nR(delta)T to calculate the change in pressure but since the problem lacks on n i can't do that

You know the volume of the tank, the initial temperature, and the initial pressure. From the ideal gas law, what is the initial number of moles n?

Chet