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  3. 1.) given the following data: c2h2(g) + 5/2 o2(g)

1.) Given the following data: C2H2(g) + 5/2 O2(g) à2CO2(g) + H2O(l)      ΔH= -1300.kJ C(s) + O2(g) àCO2(g)                                   ΔH=...

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Chemistry

1.) Given the following data:

C2H2(g) + 5/2 O2(g) à2CO2(g) +H2O(l)      ΔH= -1300.kJ

C(s) + O2(g) àCO2(g)                                 ΔH= -394kJ

H2(g) + O2(g) àH2O(l)                                ΔH= -286kJ

Use Hess’s Law to calculate ΔH for the reaction

2C(s) + H2(g) àC2H2(g)

2.) Calculate ΔH° for each of the following reactions using thedata for the enthalpy of

formation in the appendix.

2Na(s) + 2H2O(l)à2NaOH(aq) + H2(g

Answer & Explanation Solved by verified expert
4.1 Ratings (572 Votes)

target Reaction:   2C(s) + H2(g) ---------------> C2H2(g)

Given reactions are arranged to get the target reaction, by stiochiometric coefficient selection

-1x {C2H2(g) + 5/2 O2(g)---->2CO2(g) + H2O(l) }    ΔH1=   -1300.kJ

2x {C(s) + O2(g)----->CO2(g)     }                         ΔH2= -394kJ

1x{ H2(g) + O2(g) -------> H2O(l) }                       ΔH3= -286kJ

Same alegrabaic operation is to be carried out on enthapy change

So ΔH target = -1(ΔH1=   -1300.kJ) + 2x(ΔH2= -394kJ) + (ΔH3= -286kJ)

                     = 1300 +(- 788) + (-286) = 226 KJ
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