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If x(1),x(2) and x(3) are enthalpies of ...

If `x_(1),x_(2) and x_(3)` are enthalpies of H-H , O=O and O-H bonds respectively , and `x_(4)` is the enthalpy of vaporisation of water , estimate the standard enthalpy of combustion of hydrogen:

A

`x_(1)+(x_(2))/(2)-2x_(3)+x_(4)`

B

`x_(1)+(x_(2))/(2)-2x_(3)-x_(4)`

C

`x_(1)+(x_(2))/(2)-x_(3)+x_(4)`

D

`2x_(3)-x_(1)-(x_(2))/(2)-x_(4)`

Text Solution

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The correct Answer is:
B
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What will be standard enthalpy of formation of H_(2)O(l) ?

The enthalpy of solution, of sodium and sodium oxide in large volume of water , are -184 and -238 kJ/mol, respectively . If the enthalpy of formation of water is -286 kJ/ mol, then what is the enthalpy of formation of sodium oxide ? All the enthalpies are at 298 K and 1 bar pressure. [Given: REaction involved are 2Na(s)+2H_(2)O(l) to 2NaOH (aq)+H_(2)(g) Na_(2)O(s)+H_(2)O)(l) to 2NaOH (aq) ]

Knowledge Check

  • If x_(1) , x_(2) and x_(3) are enthalpies of H-H , O=O and O-H bonds respective, and x_(4) is the enthaply of vaporisation of water, estimate the standard enthalpy opf combustion of bydrogen.

    A
    `x_(1)+(x_(2))/(2)-2x_(3)+x_(4)`
    B
    `x_(1)+(x_(2))/(2)-2x_(3)-x_(4)`
    C
    `x_(1)+(x_(2))/(2)-x_(3)-x_(4)`
    D
    `2x_(3)-x_(1) -(x_(2))/(2)-x_(4)`

  • Bond angles in H-O-O and H-O-H in H_2 O_2 and water respectively are

    A
    `94.8^@,104.5^@`
    B
    `104.5^@,94.8^@`
    C
    `104.5^@,104.5^@`
    D
    `94.8^@,94.8^@`

  • The enthalpy of solution , sodium and sodium oxide in large volume of water , are -18KJ/mole and -238KJ/mol, respectively . If the enthalpy of formation of water is -286 KJ/mol, then what is the enthalpy of formation of sodium oxide ? All the enthalpies are at 298K and 1 bar pressure. [Given : reaction involved are 2Na(s)+2H_(2)O(l)to 2NaOH(aq)+H_(2)(g) Na_(2)O(s)+H_(2)O(l)to2NaOH(aq)

    A
    `+54KJ//mol`
    B
    `-130KJ//mol`
    C
    `-416KJ//mol`
    D
    `+156KJ//Mol`

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