Moles/concentration and energy change

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  • Chemistry
    • Moles
      • If you have a Mole of a substance then it would be as heavy as its mass in grams- i.e. Helium would weigh 4g if you have 1 mole of it.
      • Moles= mass(g)/ formula or atomic mass (Mr)
    • Concentration
      • Concentration= moles/ volume
      • The amount of solute dissolved in a volume of solvent.
    • Energy changes
      • Delta H- Change in energy
      • Positive= Endothermic
      • Negative= exothermic
      • If it gives out energy it is exothermic

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