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9 March, 10:12

What is the molar mass of calcium carbonate (CaCO3) ?

55 g/mol

68 g/mol

84 g/mol

100 g/mol

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Answers (2)
  1. 9 March, 10:29
    0
    Answer:100
  2. 9 March, 10:35
    0
    Answer: 15.1 grams

    Given reaction:

    Na2CO3 + Ca (OH) 2 → 2NaOH + CaCO3

    Mass of Na2CO3 = 20.0 g

    Molar mass of Na2CO3 = 105.985 g/mol

    # moles of Na2CO3 = 20/105.985 = 0.1887 moles

    Based on the reaction stoichiometry: 1 mole of Na2CO3 produces 2 moles of NaOH

    # moles of NaOH produced = 0.1887*2 = 0.3774 moles

    Molar mass of NaOH = 22.989 + 15.999 + 1.008 = 39.996 g/mol

    Mass of NaOH produced = 0.3774*39.996 = 15.09 grams
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