Consider the following problem:

"ammonia, nh3, is used as a fertilizer and as a refrigerant. what is the new pressure if 5 moles of ammonia with a volume of 750 ml at 1.50 atm is expanded to 7.50 l at constant temperature? "

in solving this with the ideal gas law, which r value will you use?

a. 8.31 l * kpa / k * mol
b. 0.0821 l * atm / k * mol
c. it doesn't matter which i choose for this problem, either of them will produce a correct answer.