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Which of the following reaction correspo...

Which of the following reaction corresponds with the definition of standard enthalpy of combustion?

A

`CH_(4) (g) + 2 O_(2) (g) rarr CO_(2) (g) + 2 H_(2) O (g)`

B

`2 CH_(4) (g) + 4 O_(2) (g) rarr 2 CO_(2) (g) + 4 H_(2) O (l)`

C

`2 CH_(4) (g) rarr 2 CO_(2) (g) + 4 H_(2) O (g)`

D

`CH_(4) (g) + 2O_(2) (g) rarr CO_(2)(g) + 2H_(2) O (l)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta_(c ) H^(@)` is the enthalpy change (amount of heat released) when one mole of the substance under standard thermodynamic conditions `(268 K`, 1 bar pressure) is completely burnt in excess of oxygen to form products under stantard thermodynamic conditions.
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Knowledge Check

  • Which of the following reactions corresponds to the definition of enthalpy of formation

    A
    `C_((g))+O_(2(g))rarrCO_(2(g))`
    B
    `C_((s))+O_(2(l))rarrCO_(2(g))`
    C
    `C_((s))+O_(2(g))rarrCO_(2(g))`
    D
    `C_((l))+O_(2(s))rarrCO_(2(g))`

  • Which of the following equations corresponds to the definition of enthalpy of formation at 298 K?

    A
    `C("graphite") + 2H_(2)(g) + 1//2O_(2)(1) to CH_(3)OH(g)`
    B
    `2C("diamond") + 2H_(2)(g) + 1//2O_(2)(g) to CH_(3) OH(I)`
    C
    `2C("graphite") + 4H_(2) (g) to O_(2) (g) to 2CH_(3)OH(I)`
    D
    `C("graphite") + 2H_(2)(g) + 1//2`

  • Which of the following equations corresponds to the definition of enthalpy of formation at 298 K?

    A
    `C_("graphite") + 2H_2(g) + 1/2 O_(2)(l) rarr CH_(3)OH(g)`
    B
    `C_("diamond") + 2H_2(g) + 1/2 O_(2)(g) rarr CH_(3)OH(l)`
    C
    `C_("graphite") + 4H_2(g) + O_(2)(g) rarr 2CH_(3)OH(l)`
    D
    `C_("graphite") + 2H_2(g) + 1/2 O_(2)(g) rarr CH_(3)OH(l)`

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