The discussion centers on calculating the final pressure in a gas reaction involving ammonia (NH3) and hydrochloric acid (HCl) in a 2.00 L flask at 25°C. The participants determined that HCl is the limiting reagent due to the 1:1 stoichiometric ratio in the reaction forming ammonium chloride (NH4Cl). To find the final pressure, it is essential to subtract the moles of the consumed gas from the total moles before applying the ideal gas law, as the solid product NH4Cl does not contribute to the gas pressure.
PREREQUISITESChemistry students, educators, and professionals involved in chemical engineering or laboratory work who need to understand gas reactions and pressure calculations.
NH3(g) + HCl(g) --> NH4Cl(s)
A 2.00 L flask containing 5.00 g of NH3 is connected to a 2.00 L flask containing 5.00 g of HCl. When the stopcock between the two flasks is opened the gases react until one of them is completely consumed. What is the final pressure in the apparatus when the reaction is complete? The temperature of the system is 25oC.