Calculations Involving Mass

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  • Calculations Involving Mass
    • Empirical Formula
      • Empirical Formula is the simplified amount of number ratio of atoms in an equation.
      • Example: Ethene has an empirical formula of CH2.
      • Question: Find the Empirical Formula for Mg and O Where it has 6g of Magnesium and 4g of Oxygen.
        • The mass of Magnesium is 6g and Oxygen is 4g
          • The RAM for Magnesium is 24 and the RAM for Oxygen is 16
            • We then divide the mass by the Relative Atomic Mass (RAM) so that will equal 0.25 for Mg and 0.25 for O
              • Mg   O mass: 6g    4g   RAM  24    16   divide mass and RAM:               0.25   0.25   Ratio: 1      1          Answer:   MgO
                • The answer is MgO
                  • Question: Find the Empirical Formula for Mg and O Where it has 6g of Magnesium and 4g of Oxygen.
                    • The mass of Magnesium is 6g and Oxygen is 4g
                      • The RAM for Magnesium is 24 and the RAM for Oxygen is 16
                        • We then divide the mass by the Relative Atomic Mass (RAM) so that will equal 0.25 for Mg and 0.25 for O
                          • Mg   O mass: 6g    4g   RAM  24    16   divide mass and RAM:               0.25   0.25   Ratio: 1      1          Answer:   MgO
                            • The answer is MgO
                              • Then we find the ratio so we divide the answer we got by the smallest number that goes into both of the number. So the ratio for Mg is 1 and O is 1
                    • Then we find the ratio so we divide the answer we got by the smallest number that goes into both of the number. So the ratio for Mg is 1 and O is 1
          • Molecular Formula
            • Molecular Formula is the exact amount of atoms in an equation.
            • Example: Ethene has a molecular formula of C2H4.
            • To find the RFM of an equation, Find the RAM of each element and multiply the number by how many atoms their are
              • E.g. The RFM for CO2 is 44. The RAM for C is 12 and we add that by 32 (The RAM for 2 oxygen)
          • Moles
            • Number of Moles = mass/RAM or RFM

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