The gas in a 600. mL balloon has a pressure of 1.20 atm. If the temperature remains constant, what will be the pressure of the gas in the balloon when it is compressed to 400. mL?

1.8 atm

Explanation:

As temperature and moles of a gas reamin both constant, we can say that:

Pressure₁. Volume₁ = Pressure₂. Volume₂

1.20 atm. 600 mL = Pressure₂. 400 mL

(1.20 atm. 600 mL) / 400 mL = Pressure ₂ → 1.8 atm