Final answer:
The temperature of the gas in the oxygen tank is approximately 245.128 K.
Step-by-step explanation:
In this question, we are given the initial pressure of oxygen in an oxygen tank, which is 3.90 atm, and the new pressure, which is 3.20 atm. We need to find the corresponding temperature in kelvin.
To solve this problem, we can use the combined gas law equation: P1 / T1 = P2 / T2. Rearranging the equation, we have T2 = (P2 * T1) / P1. Plugging in the values, T2 = (3.20 atm * 298 K) / 3.90 atm = 245.128 K.
Therefore, the temperature of the gas in the oxygen tank is approximately 245.128 K.