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28 April, 12:33

The chemical equation represents the formation of water.

2 H2 + O2 → 2 H2O

What is the total number of grams of O2 needed to produce 54 grams of water?

A

36

B

48

C

61

D

75

+5
Answers (1)
  1. 28 April, 16:27
    0
    The total number of grams of O2 is 48.0 grams (option B)

    Explanation:

    Step 1: Data given

    Mass of water = 54.0 grams

    Molar mass of water (H2O) = 18.02 g/mol

    Step 2: The balanced equation

    2 H2 + O2 → 2 H2O

    Step 3: Calculate moles of H2O

    Moles H2O = mass H2O / molar mass H2O

    Moles H2O = 54.0 grams / 18.02 g/mol

    Moles H2O = 3.00 moles

    Step 4: Calculate moles O2

    For 2 moles H2 we need 1 mol O2 to produce 2 moles H2O

    For 3.00 moles H2O we need 3.00/2 = 1.50 moles O2

    Step 5: Calculate mass O2

    Mass O2 = moles O2 * molar mass O2

    Mass O2 = 1.50 moles * 32.0 g/mol

    Mass O2 = 48.0 grams

    The total number of grams of O2 is 48.0 grams (option B)
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