Question

The pressure on 20 mL of a gas at constant temperature is changed from 4.0 atm to 2.0 atm. The new volume of the gas is: Group of answer choices 40 mL 80 mL 5 mL 10 mL

Answer 1

Answer:

40 mL

Explanation:

According to Boyle's law at a given constant temperature and amount of gas the product of it's pressure and volume is constant (or) Pressure is inversely proportional to its volume at a given temperature and amount of gas.

PV=constant.(At a given Temperature and  no of moles ).

now we are given a gas with initial pressure $P_{in}=4 atm\\V_{in}=20mL\\P_{final}=2atm$ now we are required to find out the final volume of the gas

Using PV=Constant;

$P_{in}\times V_{in}=P_{final}\times V_{final}$

substituting in the above equation we get 20*4=V*2 which implies V =40 mL