Lab 5A: Mole Baggie Lab

The purpose of this Mole Baggie Lab was to practice calculating molar mass. In Set A, the mass of the bag and the number of moles of substance was known. To calculate the molar mass, my lab partner Meghana and I weighed the bag with the substance inside. We then subtracted the bag mass by the total mass to find the mass of the substance in grams. After dividing the mass by the amount of moles, we found the molar mass, which was 60.4 g/mol. In Set B, the mass of the bag and the number of atoms was known. We again found the mass of the substance in the bag by weighing the bag and subtracting the mass of just the ziploc from it,. We then used a conversion to find the molar mass; we multiplied the number of atoms in a mol/1 mol by 1.96 g (mass of the substance)/1.51*10^22 atoms to cancel out the representative particles and leave g/mol. The molar mass turned out to be 78.1 g/mol. We then found the molar masses of the possible compounds and matched them up.

A1: sodium chloride

B6: zinc oxide