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If enthalpies of formation of C(2)H(4)(g...

If enthalpies of formation of `C_(2)H_(4)(g),CO_(2)(g)` and `H_(2)O(l)` at `25^(@)C` and 1 atm pressure are 52, -394 and -286 KJ/mol , the enthalpy of combustion of ethane is equal to

A

`+1412" kJ mole"^(-1)`

B

`-1412" kJ mole"^(-1)`

C

`+142.2" kJ mole"^(-1)`

D

`-141.2" kJ mole"^(-1)`

Text Solution

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The correct Answer is:
B
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If enthalpies of formation of C_(2)H_(4)(g)1 ,CO_(2) and H_(2)O(l) at 25(@)C and 1 atm pressure be 52,-394 and -286kJmol^(-1) respectively ,the enthalpy of combustion of C_(2)H_(4)(g) will be

At 300K , the standard enthalpies of formation of C_(6)H_(5)COOH_((s),CO_(2(g)) and H_(2)O_((l)) are -408,-393 and -286kJ mol^(-1) respectively. Calculate the heat of combustion of benzoic acid at (i) constant pressure, (ii) constant volume. (R=8.31J mol^(-1)K^(-1))

The molar enthalpies of combustion of C_(2)H_(2)(g), C("graphite") and H_(2)(g) are -1300,-394 , and -286 kJ mol^(-1) , respectively. The standard enthalpy of formation of C_(2)H_(2)(g) is

If the enthalpies of formation of C_3H_8(g), CO_2(g) and H_2O(l) at standard conditions are -104 kJ mol^-1, -394 kJ mol^-1 and -286 kJ mol^-1 respectively then the standard Enthalpy of combustion of 66 g of C_3H_8(g) will be

The enthalpies of formation of CO2(g),H2O(l) and C2H4(g) ​ are respectively −393.5,−286 and +52.3kJmol −1 . The enthalpy change for the combustion of C2H4(g) ​ is ?

Standard enthalpy of formation of C_(3)H_(7)NO_(2)(s),CO_(2)(g) and H_(2)O(l) are 133.57,-94.05 and -68.32kcal mo1^(-1) respectively Standard enthalpy combustion of CH_(4) at 25^(@)C is -212.8 kcal mo1^(-1) Calculate DeltaH^(Theta) for the reaction: 2CH_(4)+CO_(2)+1//2N_(2)rarrC_(3)H_(7)NO_(2)(s)+1//2H_(2) Calculate DeltaU for combustion of C_(3)H_(7)NO_(2)(s) .

Standard enthalpy of formation of C_(3)H_(7)NO_(2)(s),CO_(2)(g) and H_(2)O(l) are 133.57,-94.05 and -68.32kcal mo1^(-1) respectively Standard enthalpy combustion of CH_(4) at 25^(@)C is -212.8 kcal mo1^(-1) Calculate DeltaH^(Theta) for the reaction: 2CH_(4)+CO_(2)+1//2N_(2)rarrC_(3)H_(7)NO_(2)(s)+1//2H_(2) Calculate DeltaU for combustion of C_(3)H_(7)NO_(2)(s) .

From the following data, calculate the enthalpy change for the combustion of cyclopropane at 298K . The enthalpy of formation of CO_(2(g)),H_(2)O_((l)) and Propen e_((g)) are -393,-285.8 and 20.42 kJ mol^(-1) respectively. The enthalpy of isomerisation of cyclopropane to propene is -33.0kJ mol^(-1)

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is : CH_(3)OH_((l))+(3)/(2)O_(2(g))rarr CO_2((g))+2H_(2)O_((l)) At 298K standard Gibb's energies of formation for CH_(3)OH(l), H_(2)O(l) and CO_(2)(g) are -166.2,-237.2 and -394.4kJ mol^(-1) respectively. If standard enthalpy of combustion of methanol is -726kJ mol^(-1) , efficiency of the fuel cell will be :

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is : CH_(3)OH_((l))+(3)/(2)O_(2(g))rarr CO_2((g))+2H_(2)O_((l)) At 298K standard Gibb's energies of formation for CH_(3)OH(l), H_(2)O(l) and CO_(2)(g) are -166.2,-237.2 and -394.4kJ mol^(-1) respectively. If standard enthalpy of combustion of methanol is -726kJ mol^(-1) , efficiency of the fuel cell will be :

VMC MODULES ENGLISH-THERMODYNAMICS & THERMOCHEMISTRY-Impeccable
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  2. Calculate the work done when 1 mol of an ideal gas is compressed rever...

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  3. Consider the following reactions: I. C(s) + 1/2 O(2)(g) rarr CO(g),"...

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  8. Entropy changesh for the process, H(2)O(l) to H(2)O at normal pressure...

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