J.R. S. answered 05/02/19
Tutor
5.0
(145)
Ph.D. University Professor with 10+ years Tutoring Experience
Constant pressure - Charles Law
21ºC + 273 = 294K
5.00 L/294K = 2.50 L/T2
T2 = 147K = -126ºC
Decrease in temperature is 147º