20. ( 2 points) The following gases are at 25C. Which gas molecule on average has the highest kinetic energy (KE), and which gas molecule on average has the highest molecular velocity (v)? Circle one answer for each. Highest KE=N2NeArO2Cl2 All are equal Highest v=N2NeArO2Cl2 All are equal Part 3: Open Response Please show a complete solution (including work) and be attentive to significant figures. 21. When heated, ammonium nitrate decomposes: NH4NO3(s)2H2O(g)+N2O(g) Calculate the partial pressure of each gas produced when 12.08g of ammonium nitrate decomposes completely in an evacuated (empty) container at 25.00C until the total pressure is 3.70atm. Show your work and then record your answers in the boxes provided. 1. Which method(s) can be used to determine the concentration of HNO3 in an aqueous solution of nitric acid? I. titration with a standard base II. titration with a standard oxidizing agent III. precipitation with Ag I only I and II only III only I, II, and III None of these 2. A mixture of 2 moles of O2(g) and 1 mole of N2(g) is maintained in a rigid container at constant temperature. When additional N2(g) is put into the container at constant temperature, the pressure doubles. Calculate the total moles of N2 in the final mixture. 3. What is the pressure of a 6.022g sample of CH4 gas in a 30.0L container at 402K ? 0.413atm 2.42atm 6.62atm 12.4atm 22.4atm 4. A real gas will behave most like an ideal gas under which types of conditions? high temperature and high pressure high temperature and low pressure low temperature and high pressure low temperature and low pressure STP(0C,1bar)