Answer to Question #195249 in Organic Chemistry for Kasturi Patel

Question #195249

Use the following information to determine the enthalpy for the reaction shown below.

 CO2(g) + 2SO2(g) --> CS2(l) + 3O2(g)     ΔHo = ?


C(graphite) + O2(g) --> CO2(g)            ΔHo = −393.5 kJ

S(s) + O2(g) --> SO2(g)                        ΔHo = −296.8 kJ

C(graphite) + 2S(s) --> CS2(l)             ΔHo = 87.9 kJ


1
Expert's answer
2021-05-20T06:41:01-0400

The equation which e have to form is:


CO2+2SO2CS2+3O2:ΔHfCO_2+2SO_2\Rightarrow CS_2+3O_2:\Delta H_f


Equation 1:

C+O2CO2:ΔH1=393.5kJC+O_2 \Rightarrow CO_2:\Delta H_1=-393.5kJ


Equation 2:

S+O2SO2:ΔH2=296.8kJS+O_2 \Rightarrow SO_2 :\Delta H_2=-296.8kJ


Equation 3:

C+2SCS2:ΔH3=87.9kJC+2S \Rightarrow CS_2: \Delta H_3=87.9kJ


Now to form the main equation we have to

\Rightarrow Equation1+2(Equation2)Equation3Equation1+2(Equation 2)-Equation 3

ΔHf=ΔH1+2ΔH2ΔH3\Delta H_f=\Delta H_1+2\Delta H_2-\Delta H_3

ΔHf=393.5+2(296.8)87.9=1075kJ\Delta H_f=-393.5+2(-296.8)-87.9=-1075kJ


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