Two different compounds containing osmium and oxygen have the following masses of oxygen per gram of osmium: 0.168 and 0.3369 g. Show that these amounts are consistent with the law of multiple proportions.
Solution 35E Isotopes are atoms with the same number of protons but have different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, we can also say that isotopes are elements with the same atomic number but ifferent mass number. Now, let’s calculate the atomic weight of copper isotopes : Atomic weight of an element is determined by taking average of atomic masses and respective relative abundance value of its isotopes. Given, The 2 isotopes of copper are Cu and Cu.65 63 Atomic mass of Cu = 62.9296 amu with 69.17% abundance. Atomic mass of Cu = 64.9278 amu with 30.83% abundance. Therefore, = (62.9296 amu)(0.6917)+(64.9278 amu)(0.3083) [abundance is written in decimals] = 43.5284 amu + 20.017241 amu = 63.545amu