L*atm conversion to Joules

[Jordan_Wesson_2J]

Why does the book use the the two gas constants (8.314 J/K/mol divided by 0.0826 L*atm/K/mol) instead of the direct unit conversion? And which should we use on the test?

[Manya Bali 4E]

I don't know which problem you're referring to, but you can figure out which constant you need to use based on the units of the numbers in your equation. Typically, you want all the units except joules to cancel out, but it depends on the problem. I don't think it should change the answer whether you use both of those constants to go from one type of unit to another or a direct conversion, but if you show the specific problem, we might be able to help a bit more.

[Jessica Castro 2H]

The standard units for Rydberg's constant are J/K/mol. But if you need to use pressure in your equation, the conversion is 1 L atm = 101.325 J