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7 November, 09:39

How many molecules of glucose, C6H12O6, can be "burned" biologically when 283.2 grams of oxygen is a available?

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  1. 7 November, 10:12
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    Answer is: 8,85·10²³ molecules of glucose.

    Chemical reaction: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O.

    m (C₆H₁₂O₆) = ?

    m (O₂) = 283,2 g.

    n (O₂) = m (O₂) : M (O₂).

    n (O₂) = 83,2 g : 32 g/mol.

    n (O₂) = 8,85 mol.

    from reaction: n (O₂) : n (C₆H₁₂O₆) = 6 : 1.

    n (C₆H₁₂O₆) = 1,475 mol.

    N (C₆H₁₂O₆) = n · Na

    N (C₆H₁₂O₆) = 1,475 mol · 6·10²³ 1/mol = 8,85·10²³.

    Na - Avogadro number.
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