A mixture of 2.00 g of H_2 and 16.00 g of O_2 is placed in a 2.00-L flask at 35.0 degree C. Assuming each gas behaves as an ideal gas, calculate the partial pressure of oxygen gas. Please write your answer (unit: Pa) with two decimals in E notation, such as 2.33E4, without unit. In the above question (question 1), what is the mole fraction of oxygen X_02? Please write your answer with two decimals, as 0.54. A balloon contains 2.0 mol H_2, 2.0 mol N_2 and 6.0 mol He at 273.15 K. If the balloon floats at a location where air pressure is 0.78 atm, what is the partial pressure of N_2 PN_2 (unit: Torr)? Please write your answer with 2 decimals, as 200.23