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    Sgilbert19's Avatar
    Sgilbert19 Posts: 1, Reputation: 1
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    #1

    Jan 18, 2017, 08:34 AM
    Endothermic reactions
    Select all of the following reactions that are endothermic.

    H2(g) + ½O2(g) → H2O(g), ΔH = -57.83 kcal/mole
    ½N2(g) + ½O2(g) → NO(g), ΔH = +21.6 kcal/mole
    ½N2(g) + O2(g) + 8.1 kcal → NO2(g)
    ½N2(g) + 3/2H2(g) → NH3(g) + 11.0 kcal/mole
    NH3(g) → ½N2(g) + 3/2H2(g), ΔH = +11.0 kcal/mole
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Jan 18, 2017, 09:26 AM
    42... Unless it's a full moon with Jupiter waning. Then its 43.



    This is your homework.. rules state you have to show us your work and answer before we can help you.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Jan 18, 2017, 03:16 PM
    Endo vs exo, what is the difference? Delta H what does that mean? Take the first one. Mix H2 and O2. What will happen ? Does it react by itself? Does it need something?
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