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3. Isotopes and Mass calculations

3. Isotopes and Mass calculations. Objectives: Defining and calculating Ar and Mr for ionic and molecular substances. Relative atomic mass Calculations. What is relative atomic mass calculated from? Why is it rarely a whole number? Find the Ar of the following: Caesium Cadmium Copper

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3. Isotopes and Mass calculations

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  1. 3.Isotopes and Mass calculations Objectives: Defining and calculating Ar and Mr for ionic and molecular substances

  2. Relative atomic massCalculations • What is relative atomic mass calculated from? • Why is it rarely a whole number? • Find the Ar of the following: Caesium Cadmium Copper 4. How is Ar different from Relative Isotopic mass?

  3. The periodic table states that the Relative Atomic Mass (Ar) of Boron is 11 Boron has two naturally occurring isotopes. 80% of all Boron is B11 (6 neutrons) 20% of all Boron is B10 (5 Neutrons) Calculate the average relative atomic mass of Boron. (80 x 11) + (20 x 10) = 100 10.8

  4. The periodic table states that the Relative Atomic Mass (Ar) of Copper is 64 Copper has two naturally occurring isotopes. 69% of all Copper is Cu63 (34 neutrons) 31% of all Copper is Cu65 (36 Neutrons) Calculate the average relative atomic mass of Boron. (69 x 63) + (31 x 65) = 100 63.6

  5. The periodic table states that the Relative Atomic Mass (Ar) of Magnesium is 24 Magnesium has three naturally occurring isotopes. 79% of all Magnesium is Mg24 (12 neutrons) 11% of all Magnesium is Mg25 (13 Neutrons) 10% of all Magnesium is Mg26 (14 neutrons) Calculate the average relative atomic mass of Magnesium. (79 x 24) + (11 x 25) + (10 x 26) = 100 24.3

  6. Relative molecular massCalculations • Write the definition for this • How do you calculate Mr? • Find the relative molecular mass of the following compounds: NH4 CO2 C6H12O6

  7. Relative formula massCalculations • Write the definition for this • How id this different to Relative Molecular mass? • How do you calculate Relative formula mass? • Find the relative molecular mass of the following compounds: CaF2 SiO2 NaOH

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