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11 April, 16:27

Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change represented by x?

3C + 3O2 yields 3CO2 deltaH = - 1182 kJ

4H2 + 2O2 yields 4H2O deltaH = - 1144 kJ

C3H8 + 5O2 yields 3CO2 + 4H2O deltaH = x

3H8 3C + 4H2 H = 104 kJ

A. 104 = (-1182) - [x + (-1144) ]

B. 104 = x - [ (-1182) + (-1144) ]

C. 104 = (-1182) + (-1144) + x

D. 104 = x + (-1182) - (-1144)

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Answers (1)
  1. 11 April, 17:34
    0
    In order to solve this, we need to make use of Hess' Law.

    We are already given the equations and their corresponding deltaH. Using Hess' Law, we can generate this equation:

    104 kJ = x - (-1182 kJ) - (-1144 kJ)

    Among the choices, the answer is

    B. 104 = x - [ (-1182) + (-1144) ]
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