Home
Class 12
CHEMISTRY
The enthalpy change for the reaction C(3...

The enthalpy change for the reaction `C_(3)H_(8)(g)+H_(2)(g) rarr C_(2)H_(6)(g)+CH_(4)(g)` at `25^(@)C` is -55.7 kJ/mol. Calculate the enthalpy of combustion of `C_(2)H_(6)(g)`. The enthalpy of combustion of `H_(2)`, & `CH_(4)` are -285.8 & -890.0 kJ/mol respectively. enthalpy of combustion of propane is `-2220" kJ mol"^(-1)`.

Text Solution

Verified by Experts

As we know any thermochemical `eq^(n)` can be written in terms of heat of combustion as follows
`Delta H_(r)^(@) = Delta H_(c)^(@) ` (Reactant) - `Delta H_(c)^(@)` (Product)
`DeltaH_(r)^(@) = DeltaH_(c)^(@) (C_(3) H_(8)) + DeltaH_(c)^(@) (H_(2)) - {Delta H_(c)^(@) (C_(2)H_(6)) + Delta H_(c)^(@) (CH_(4))} - 55.7 = (-2220 - 285.8) - {- 890 + Delta H_(c)^(@) (C_(2) H_(6))}`
`implies DeltaH_(c)^(@) (C_(2) H_(6)) (g) = -1560 .1 kJ mol^(-1)`
Promotional Banner

Topper's Solved these Questions

  • THERMOCHEMISTRY

    MOTION|Exercise EXERCISE -1 SECTION - A|5 Videos

  • THERMOCHEMISTRY

    MOTION|Exercise EXERCISE -1 SECTION - B|9 Videos

  • SURFACE CHEMISTRY

    MOTION|Exercise Exercise - 3 (Level-II)|12 Videos

  • THERMODYNAMICS

    MOTION|Exercise EXERCISE - 4 (LEVEL - II)|19 Videos

Similar Questions

Explore conceptually related problems

The enthalpy change of the reaction C_3H_8(g)+H_2(g) rarr C_2H_6(g)+CH_4(g) , at 25^@ , will be Given that: heat of combustion values under standard condition (The standard heat of formation of C_3H_8(g) is -103.8kJ/mol)

The standard enthalpy of formation of octane (C_(8)H_(18)) is -250kJ //mol . Calculate the enthalpy of combustion of C_(8)H_(18) . The enthalpy of CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

Enthalpy of combustion of CH_(4) , C_(2)H_(6) and C_(3)H_(8) are -210-370 and -530Kcal//mol respectivaly. The approximate value of enthalpy of combustion of n -hexane is

The enthalpy of formation for C_(2)H_(4)(g) , CO_(2)(g) and H_(2)O(l) at 25^(@)C and 1 atm. Pressure be 52 , -394 and -286 kJ mol^(-1) respectively. The enthalpy of combustion of C_(2)H_(4)(g) will be

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

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)