Question: What is the value of R used in the standard chemistry units of (atm Liters)/(mol Kelvin)? Try using the factor label to convert the SI unit of Joules /mol K into the chemistry units (atm Liters)/(mol K). Question: Explain why must the absolute temperature scale be used in the ideal gas law? (Think about how the ideal gas law equation might fail if we used Celsius or Fahrenheit.)