Question

In: Chemistry

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

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) à H2O(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 the data for the enthalpy of

formation in the appendix.

2Na(s) + 2H2O(l)à2NaOH(aq) + H2(g

Expert Solution

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

queen_honey_blossom answered 9 months ago

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