# Comparison Of Copper And Relative Atomic Mass

509 Words3 Pages
If the mass of one element is known then the mass of another element can be found by first finding the ratio of the two elements. In other words, the ratios of these elements can be used to convert from the mass of an element to the mass of the other element (p. 58). Once you know the ratio of the known mass of that element you can form an equation, which will give you the mass of the unknown element. The equation should include the mass of one of the reactants and products and the amount of moles that will be equivalent to the mass. Once you have finished your calculations, that answer can be used to find the moles and even the atoms of the other recant or product. The relative atomic mass is not the same as the mass of an exact atom, but…show more content…
In order to find the weight of copper, first the scale had to be set to zero with the beaker already placed on it. Then add the zinc metal (about 1.0 to 1.1 grams) to the beaker, and weigh it again. The next step is to add the sulfate solution (about 20 mL) to the zinc sample. Once that is added and is thoroughly stirred the zinc particles and have seen that they have been replaced by copper particles, then begin decanting the supernatant (p.59). Wash and decant the remaining copper inside the beaker, first with water then with acetone, repeatedly to thoroughly remove the sulfate solution. Place the beakers in a hot bath (about 10 minutes) to boil away any excess acetone or water. Once the beakers have cooled down, weigh them on the balance, which will give the weight of the copper. To find the mass ratio as stated previously, use the weight of both the zinc and copper. Conversions, along with using the mass of zinc found throughout the experiment, Avogadro’s number and the atomic mass of zinc are used to find the number of moles and atoms of zinc that were added to the