Final answer:
To convert Celsius to Kelvin, add 273.15 to the Celsius temperature. Therefore, the carbon dioxide gas in the tank at 20.0°C has a temperature of 293.15 K.
Step-by-step explanation:
The temperature of the gas in Kelvin can be calculated by converting the Celsius temperature given. For the 16.0-L tank of carbon dioxide gas at 20.0°C, the temperature in Kelvin is:
T(K) = 20.0°C + 273.15 = 293.15 K