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If the percent oxygen in a sample of MgO was calculated to be 36%, what is...

  1. If the percent oxygen in a sample of MgO was calculated to be 36%, what is the % error if the correct answer is 40%
  2. If a sample of aluminum ribbon weighing 0.500 gram was burned and the resulting oxide weighed 0.945 grams, what is the formula for the oxide?
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