Final answer:
The temperature inside the tank is 162 K.
Step-by-step explanation:
To solve this problem, we can use the ideal gas law equation: PV = nRT, where P is the pressure in atm, V is the volume in liters, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Let's rearrange the equation to solve for T:
T = PV / (nR)
Plugging in the given values, we have:
T = (3.50 atm) * (20.0 L) / (4.60 mol * (0.0821 L.atm/K.mol))
T = 161.96 K
So, the temperature inside the tank is 162 K.