Answer: 67.23 L
Step-by-step explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
 of particles.
 of particles. 
To calculate the number of moles, we use the equation: 
 
 
 
 Putting in the values we get: 
 
 
1 mole of methane occupies = 22.4 L
Thus 3 moles of methane occupy = 

Thus volume of 48 grams of methane gas is 67.23 L