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15 May, 14:03

Thermochemical Equations Practice

1) Using the balanced thermochemical equation below:

2H2 + O2 + 2H20 + 241.8 kJ

How much heat is released when 12.5 grams of hydrogen (Hz) are

completely reacted?

+2
Answers (1)
  1. 15 May, 17:24
    0
    755.625 kj

    Explanation:

    Given dа ta:

    Heat released by two mole of H₂ = 241.8 Kj

    Heat released by 12.5 grams of H₂ = ?

    Solution:

    Number of moles of hydrogen:

    Number of moles = mass / molar mass

    Number of moles = 12.5 g / 2 g/mol

    Number of moles = 6.25 mol

    Chemical equation:

    2H₂ + O₂ → 2H₂O + 241.8 kj

    Now we will determine the heat released by 6.25 moles of hydrogen.

    2 mole = 241.8 kj

    1 mole = 241.8 kj/2 = 120.9 kj

    120.9 kj * 6.25 = 755.625 kj
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