Chemistry Practice Problems Pressure Units Practice Problems Solution: An ordinary gasoline can measuring 30.0 cm by 25.0...

Solution: An ordinary gasoline can measuring 30.0 cm by 25.0 cm by 20.0 cm is evacuated with a vacuum pump.Assuming that virtually all of the air can be removed from inside the can, and that atmospheric pressure is 14.7 psi, what is the total force (in pounds) on the surface of the can?

Problem

An ordinary gasoline can measuring 30.0 cm by 25.0 cm by 20.0 cm is evacuated with a vacuum pump.

Assuming that virtually all of the air can be removed from inside the can, and that atmospheric pressure is 14.7 psi, what is the total force (in pounds) on the surface of the can?

Solution

We have to calculate the force (in pounds) on the surface of a can from which all of air is sucked our using a vacuum pump.


When the can is emptied, the pressure on the can will be the atmospheric pressure. We can calculate the force on its surface using this formula:

Pressure = ForceArea


We will now follow these steps to solve this problem:

Step 1: Calculate the total surface area of the can.

Step 2: Calculate the surface area to in2 units.

Step 3: Calculate the force in pounds.

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