Question 1196300
PV = k	Pressure multiplied by volume equals some constant k
where P is the pressure of the gas, V is the volume of the gas, and k is a constant.

The equation says that the product of pressure and volume is a constant for a given volume of confined gas and this holds as long as the temperature is constant. For comparing the same substance under two different sets of conditions, the law can be usefully expressed as:


P1V1 = P2V2 

Given:
P1 = 5atm
V1 = 20.00 liters
V2 = 10.00 liters
P2= ?

Substitute to calculate P2
5(20) = 10(P2)
P2 = 100/10
P2 = 10 atm

Answer:
The pressure of the gas is 10 atm if volume is reduced to 10.0 liters at the same temperature.