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4 June, 16:13

Which contains the greatest mass of oxygen: 0.75 moles of ethanol (C2H5OH), 0.60 mole of formic acid (HCO2H), or 1.0 mole of water (H2O) ? Why?

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  1. 4 June, 16:16
    0
    0.60 mole of formic acid contains the greatest mass of oxygen

    (19.2 grams)

    Explanation:

    Step 1: Data given

    Moles of ethanol = 0.75 moles

    Molar mass ethanol = 46.07 g/mol

    Moles of formic acid = 0.60 moles

    Molar mass of formic acid = 46.03 g/mol

    Moles of H2O = 1.0

    Molar mass of H2O = 18.02 g/mol

    Step 2: Calculate moles of oxygen in each

    Ethanol: For 1 mol ethanol we have 1 mol oxygen

    For 0.75 moles ethanol we have 0.75 moles O

    Mass O = 0.75 moles * 16.0 g/mol = 12.0 grams O

    Formic acid: For 1 mol formic acid, we have 2 moles O

    For 0.60 moles formic acid, we have 2*0.60 = 1.20 moles O

    Mass O = 1.20 moles * 16.0 g/mol = 19.2 grams O

    H2O: for 1.0 mol H2O we have 1 mol O

    Mass O = 18.02 g/mol * 1.0 mol = 18.02 grams

    0.60 mole of formic acid contains the greatest mass of oxygen

    (19.2 grams)
  2. 4 June, 16:35
    0
    In conclussion, 0.60 moles of HCOOH contains the greatest mass of O

    Explanation:

    Let's make some rules of three, to solve this problem:

    1 mol of ethanol has 2 moles of C, 6 moles of H, and 1 mol of oxygen

    Therefore, 0.75 moles of ethanol must have 0.75 mol of oyxgen

    Let's convert the moles to mass → 0.75 mol. 16 g / 1 mol = 12 g

    1 mol of formic acid has 2 moles of H, 1 mol of C and 2 mol of oxygen

    0.60 moles of formic acid must have (0.6.2) / 1 = 1.2 mol of O

    If we convert the amount to mass → 1.2 mol. 16 g / 1mol = 19.2 g

    1 mol of water has 1 mol of oyxgen

    Therefore, we have 1 mol of oxygen with a mass of 16 g.

    In conclussion, 0.60 moles of HCOOH contains the greatest mass of O
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