A container of pure helium has a volume of 200 cm3, a temperature of 50oC, and a pressure of 2.0 bar. How many moles of helium are present?

Answer 1

new day... same old troll

Answer 2

n = PV / RT = (2.0 bar) x (0.200 L) / ((0.083144598 L bar/K mol) x (50 + 273) K) =

0.015 mol

Answer 3

PV = nRT   or in this case

n = PV/RT

Plug in your values and solve