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    Calculate DH for the reaction: C2H4 (g) + H2 (g) -> C2H6 (g), from the following data.
    C2H4 (g) + 3 O2 (g) -> 2 CO2 (g) + 2 H2O (l) (-1411)

    C2H6 (g) + 3½ O2 (g) -> 2 CO2 (g) + 3 H2O (l) (-1560 kJ)


    H2 (g) + ½ O2 (g) -> H2O (l) (-285.8 kJ)

    How do I construct thew Hess Cycle for this equation
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    I got the one above but not this one:


    Calculate DH for the reaction 2 Al (s) + 3 Cl2 (g) -> 2 AlCl3 (s) from the data.

    2 Al (s) + 6 HCl (aq) -> 2 AlCl3 (aq) + 3 H2 (g) [-1049 kJ]

    HCl (g) -> HCl (aq) [ -74.8 kJ]

    H2 (g) + Cl2 (g) -> 2 HCl (g) [ -1845. kJ]

    AlCl3 (s) -> AlCl3 (aq) [-323. kJ]
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    Work it backwards. AlCl3(s) comes from AlCl3(aq), which comes from......
 
 
 
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