In the ideal gas law equation, pv = nrt, what is the value of the variable ���r'?
a. r = 3.81 [(kpa * liters) / (k * moles)]
b. r = 8.31 [(kpa * k) / (liters * moles)]
c. r = 8.31 [(kpa liters) / (k moles)]
d. r = 8.31 [(kpa * liters) / (k * moles)]