How much? 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: AmberCoombesCreated on: 10-11-15 09:31 What is an isotope? An isotope is an atom of the same element with a different number of neutrons (mass number) 1 of 6 Calculate the average mass of chlorine given that 75% is chlorine 35 and 25% is chlorine 37. 75% of 35 = 26. 25% of 37 = 9.25 26.25 + 9.25 = 35.5 2 of 6 Bromine contains 50.5% bromine-79 and 49.5% bromine- 81. 50.5 / 100 = 0.505 x 79 = 39.395 49.5 / 100 = 0.495 x 81 = 40.095 39.895 + 40.095 = 79.99 3 of 6 How do you calculate the mass of the compound? You add all of the mass numbers together 4 of 6 Calculate the mass of calcium carbonate. 40+12+16+16+16= 100g 5 of 6 How do you calculate percentage composition? (number of atoms in element) x (atomic mass of element) x 100 / Formula mass of the compound 6 of 6
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