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## Homework Statement

A wheel has volume 500 cm

^{3}and the initial pressure inside of it is 0.5 atm. The wheel is pumped using a pump having volume 50 cm

^{3}. The atmospheric pressure is 76 cmHg and there is no change in temperature. What is the pressure of the wheel after being pumped 4 times?

## Homework Equations

PV = nRT

## The Attempt at a Solution

I don't know how to set up the equation.

After being pumped 4 times, the final volume of wheel will be: 500 + 4 x 50 = 700 cm

^{3}??

There will be change of n because more molecules of gas inside the wheel after pumping so the equation will be:

P

_{1}.V

_{1}/ n

_{1}= P

_{2}.V

_{2}/ n

_{2}??

There is no information about the moles and I don't know how to use information about given from the question.

Thanks