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March 28, 2017

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Calculate the entropy change when 4.44g of H2 reacts with O2 according to the reaction
2H2(g) + O2(g)→2H2O(ℓ)
at 298 K and 1 atm pressure. The stan-
dard molar enthalpy of formation of H
2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy of formation is −237.2 kJ/mol.
Answer in units of J/K

  • AP Chemistry - ,

    I would rewrite the equation as
    H2 + 1/2 O2 ==> H2O
    dGof = dHof - TdSof
    You know dGo and dHo and T, solve for dS.
    That gives you dS for 1 mol H2O from 1 mol H2. You have 4.44g/2 = 2.22 mols
    dS for 1 mol x 2.22 mol = ?

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