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?

we have to double the pressure.

Explanation:

b/c according to boyle's" the volume of a given mass of gas is inversely proportional to its pressure in a constant temperature.

P1*V1=P2*V2

we have P1=1 atm because it is at STp

V1=50L

V2=25L because we want to cut the volume of the gas in half .

and we can find P2

from the above formula we have P2=P1*V1/V2

P2=1*50/25=50/25=2

so when we doubled the pressure the volume will be halved.