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23 April, 20:36

Chem question! With reference to the "Chemistry at Work" box on explosives, use bond enthalpies to estimate the enthalpy change for the explosion of 1.00 g of nitroglycerin.

I found that the answer is 7.85 KJ, but how?

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  1. 23 April, 23:53
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    The mass of nitroglycerin is 1 g,

    Molar mass of nitroglycerin is 227 g/mol

    The number of moles = moles/molar mass

    = 1 g / 227 g/mol

    = 0.004405 mol

    The equation for the bond enthalpy of the reaction is shown below, thus, the total enthalpy change in the reaction is as follows:

    ΔHreaction = Number of moles (∑ΔHbond break - ∑ΔH bond forms)

    = 0.004405 mol * - 3564.5 kJ/mol

    = - 7.85 kJ
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