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Exam 2

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48 questions

  • 1. Open Ended
    30 seconds
    1 pt
    Lithium oxide can be produced by the reaction shown below. If a manufacturing company wants to make 25.0 g of Li2O, what mass of Li is necessary? [Molar masses: Li, 6.94 g/mol; O, 16.00 g/mol] 4Li(s) + O2(g) → 2Li2O(s)
  • 2. Open Ended
    30 seconds
    1 pt
    Dinitrogen monoxide, or laughing gas (N2O), is used as a dental anesthetic and as an aerosol propellant. How many molecules of N2O are present in a 12.6 g sample of the compound?
  • 3. Open Ended
    30 seconds
    1 pt
    Consider the two beakers labeled A and B. Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these samples is known with certainty?
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