What is the temperature, in K, of 2.20 moles of gas occupying 3.5 L at 3.30 atm?
To figure this out you need to start with the ideal gas equation:
You have P (3.30 atm), V (3.5 l), n (2.20 moles) and you can look up the gas constant, R (0.082057 (latm)/(molK)).
We simply rearrange the ideal gas equation to get T by itself:
Then simply plug in the values you were given, making sure that the units are in liters, atmospheres, and moles (which they are, in this case):
Since volume was only given to 2 significant figures, we can only report 2 significant figures for our answer: