Amoun of gas help Plz

Question

P1V1=P2V2

Part A

A sample of ideal gas at room temperature occupies a volume of 11.0 L at a pressure of 672 torr. If the pressure changes to 3360 torr, with no change in the temperature or moles of gas, what is the new volume, V2?

V2=?

Part B

If the volume of the original sample in Part A (P1 = 672 torr, V1 = 11.0 L) changes to 79.0 L, without a change in the temperature or moles of gas molecules, what is the new pressure, P2?

P2=?

Answer 1

Since there is no change to temperature, then you have the correct equation noted:

P₁V₁ = P₂V₂

Part A asks for V₂, so solving for V₂, we get V₂ = P₁V₁/P₂

V₁ = 11.0 L, P₁ = 672 torr, P₂ = 3360 torr so, just plug in the numbers into your calculator (672)(11.0)/(3360) = 2.20 meaning V₂ = 2.20 L

Part B asks for P₂, so solving for P₂ we get: P₂ = P₁V₁/V₂

V₁ = 11.0 L, P₁ = 672 torr, V₂ = 79.0 L so, just plug in the numbers into your calculator (672)(11.0)/(79.0) = 93.6 meaning P₂ = 93.6 torr

What about this did you have trouble understanding?