the enthalpy change for the reaction C3H8 + H2 =C2H6 + CH4 at 25*c is

1.	the enthalpy change for the reaction C3H8 + H2 =C2H6 + CH4 at 25*c is 55.7 kj/mole Calculate the heat of combusition of C2H6 .the heat of combustion of H2.CH4,C[graphite] are -285.8 , -890.0 , -393.5 kj/mole respestevily . Heat of combustion of propani is -2240 kj/mole
Answer» Given C₃H₈ + H₂ =C₂H₆+ CH_4,ΔH₁= + 55.7 kJ/mole H₂+1/2O₂ =H₂O, ΔH₂= -285.8 kJ/mole CH₄+2O₂ =CO₂+2H₂O, ΔH₃= -890.0 kJ/mole C(graphite)+O₂ =CO₂, ΔH₄= -393.5 kJ/mole C₃H₈ +5 O₂ =3 CO₂+4H₂O_,ΔH₅= -2240 kJ/mole we are to measure C₂H₆ +7/2 O₂ =2CO₂+3H₂O_,ΔH₆= ? kJ/mole So ΔH₆ = ΔH₅- ΔH₁+ ΔH₂- ΔH₃ = -2240- 55.7+ (-285.8) -(-890.0) = -1691.5 kJ/mole

the enthalpy change for the reaction C3H8 + H2 =C2H6 + CH4 at 25*c is 55.7 kj/mole Calculate the heat of combusition of C2H6 .the heat of combustion of H2.CH4,C[graphite] are -285.8 , -890.0 , -393.5 kj/mole respestevily . Heat of combustion of propani is -2240 kj/mole

Answer»

Given

C₃H₈ + H₂ =C₂H₆+ CH_4,ΔH₁= + 55.7 kJ/mole

H₂+1/2O₂ =H₂O, ΔH₂= -285.8 kJ/mole

CH₄+2O₂ =CO₂+2H₂O, ΔH₃= -890.0 kJ/mole

C(graphite)+O₂ =CO₂, ΔH₄= -393.5 kJ/mole

C₃H₈ +5 O₂ =3 CO₂+4H₂O_,ΔH₅= -2240 kJ/mole

we are to measure

C₂H₆ +7/2 O₂ =2CO₂+3H₂O_,ΔH₆= ? kJ/mole

ΔH₆ = ΔH₅- ΔH₁+ ΔH₂- ΔH₃

= -2240- 55.7+ (-285.8) -(-890.0)

= -1691.5 kJ/mole

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the enthalpy change for the reaction C3H8 + H2 =C2H6 + CH4 at 25*c is 55.7 kj/mole Calculate the heat of combusition of C2H6 .the heat of combustion of H2.CH4,C[graphite] are -285.8 , -890.0 , -393.5 kj/mole respestevily . Heat of combustion of propani is -2240 kj/mole

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