CHM 1311 Study Guide - Dgh, Molar Mass, Eudiometer
Document Summary
Pv=nrt (9714pa)(2. 81x10-5m3)=nexperimental(8. 314jk-1mol-1)(296k) nexperimental=((9700pa)(2. 81x10-5m3))/ ((8. 314jk-1mol-1)(296k)) nexperimental= 1. 11x10-4 moles of hydrogen: moles of hydrogen gas (theoretical): Mh2=2. 016g/mol mmg/1 mol mg=mh2/1 mol h2 (0. 0265g/1 mol mg)= mh2/1 mol h2 (0. 0265g/1 mol mg)(1 mol h2)= mh2 mh2=0. 0265g n=m/m. =(0. 0265g)/(2. 016/mol) n=0. 0131 or 1. 31x10-2 moles of hydrogen: percentage purity of metal: nexperimental=1. 11x10-4mol ntheoretical=1. 31x10-2mol. There were essentially four parts that were supposed to be accomplished in this lab. The first part was to find the volume of the uncalibrated tip of a eudiometer, which turned out to be a fairly simple process. After this process was completed, a calculation was performed to find out the number of moles of a pure metal (magnesium) reacted with an acid. This was then compared with the mass of metal used to determine the purity percentage of the metal, followed by repeating these same steps with an alloy, which was used for the second part of the experiment.
