Question

PRORO332 Evaluation of the Gas Law Coestant 69 Dahida Ch Date Pre-Laboratory Assi nt gnme 1. A student following the procedure described in this module collected the following data: mass Mg,8 initial syringe volume, mL final syringe volume, mL barometric pressure, torr temperature, K 0.0243 1.0 26.5 754 298 Calculate the gas law constant. 2. What would be the volume of hydrogen gas produced by the reaction of 0.243 g of magnesium metal and collected at 750 torr and 298 K? Use the value for R found in Pre-Laboratory Assignment 1. 3. The results of this experiment are greatly affected by the care with which each of the steps is completed. (1) Describe the error that would occur if the magnesium were to slide into the HCl in the test tube before the system is sealed off.

Answer 1

Mass of M_g = 0.0243 gm = m Molar mass of M_g = M = 24.3 gm/mol Volume = V = 26.5 - 1.0 = 25.5 ml = 0.0255 L Pressure = P = 754 foss = 754/760 atm = 0.992 atm Temperature = T = 298 K PV = nRT rightdblarrow PV = m/M RT rightdblarrow R = MPV/mT R = (24.3) (0.992) (0.0255) /(0.0243) (298) R = 0.0849 L.atm/mol.k = Gas Constant