You have 50 L of CO2 gas at standard temperature and pressure (STP). What would need to be done to the pressure to cut the volume of gas in half?

The pressure is doubled(2 atm)

Given

50 L of CO₂ gas at STP

Required

The pressure

Solution

Changing pressure, constant temperature⇒Boyle's Law

At a fixed temperature, the gas volume is inversely proportional to the pressure applied  

STP⇒1 atm, T=273 K

The (new) volume of gas in half, so V₂=0.5 V₁ = 0.5 x 50 = 25 L

Because the gas volume is inversely proportional to the pressure than the pressure doubled = 2 atm

Or we can use the formula :

P₂=(P₁V₁)/V₂

P₂=(1 atm x 50 L)/25 L

P₂= 2 atm

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