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Homework Help: Interesting Chemistry Question (Metals And Non Metals)

  1. Jan 27, 2010 #1
    A 2 gram Magnesium (Mg) ribbon is burnt in air . The burnt ribbon is collected and weighed. Would it be greater than 2 grams or lesser?
  2. jcsd
  3. Jan 27, 2010 #2
    more than two grams because the magnesium bonds with oxygen when energy is added and forms MgO
  4. Jan 27, 2010 #3
    The products would be equal to the mass of the reactants as it states in the law of conservation of mass.

    2Mg + O2 → 2MgO

    The 2 gram ribbon plus the weight of the oxygen required produces 2 grams plus the weight of the oxygen used.
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