Calculations

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• Created by: Katie
• Created on: 23-04-13 11:36
• Calculations
• Relative Atomic mass & formula mass
• ATOMIC MASS (Ar)- how heavy atoms are- being the mass number of an element (found in the periodic table). e.g. Helium's Ar = 4.
• FORMULA MASS (Mr)- how heavy compounds are- which is basically all the relative atomic masses added together. e.g. MgCl2= 24+(35.5)= 95.
• Untitled
• No. of moles= Mass(g) of the element ÷ Mr
• Moles
• ONE MOLE of a substance is EQUAL to its Mr in GRAMS
• No. of moles= Mass(g) of the element ÷ Mr
• Moles
• ONE MOLE of a substance is EQUAL to its Mr in GRAMS
• The relative formula mass of a substance in grams is known as one mole of the substance
• e.g. Iron has an Mr of 56. So one mole of iron weighs exactly 56g.
• The relative formula mass of a substance in grams is known as one mole of the substance
• Calculations
• Relative Atomic mass & formula mass
• ATOMIC MASS (Ar)- how heavy atoms are- being the mass number of an element (found in the periodic table). e.g. Helium's Ar = 4.
• FORMULA MASS (Mr)- how heavy compounds are- which is basically all the relative atomic masses added together. e.g. MgCl2= 24+(35.5)= 95.
• Untitled
• e.g. Iron has an Mr of 56. So one mole of iron weighs exactly 56g.