ajaco40 ajaco40 12-07-2021 Chemistry contestada QUESTION 4 A flask has 1.50 moles of hydrogen gas at 30.0 °C and a pressure of 375 mm Hg. After the addition of more hydrogen gas at the same temperature, the pressure rises to 1.50 atm. How many moles of hydrogen gas are added? 1 atm - 760 mm Hg.