Solution: What is the pressure in atm exerted by a mixture of 1.00 g H 2 and 5.00 g He when the mixture is contained in a volume of 5.00 L at 20.0°C? a) 8.4 b) 7.84 c) 28.8 d) 0.574 e) 7.71   What is the partial pressure in atm exerted by the H 2 in the gaseous mixture described in the previous question? a) no given answer is close b) 0.115 c) 2.4 d) 5.76 e) 1.54