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DeltaS("surr") " for " H(2) + 1//2O(2) r...

`DeltaS_("surr") " for " H_(2) + 1//2O_(2) rarr H_(2)O, DeltaH -280 kJ` at 400K is

A

700 J/g/K

B

700 KJ / mol / K

C

700 J/mol/K

D

0.7 J/mol / K

Text Solution

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The correct Answer is:
C
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If S + O_(2) rarr SO_(2), Delta H = -398.5 kJ SO_(2) + (1)/(2)O_(2) rarr SO_(3), Delta H= -98.7kJ , SO_(3) + H_(2)O rarr H_(2)SO_(4), Delta H= - 130.5kJ H_(2) + (1)/(2) O_(2) rarr H_(2)O, Delta H= -227.3kJ If magnitude of enthalpy of formation of sulphuric acid at 298K is 95x, x= ?

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Knowledge Check

  • Delta S _(sur) for H _(2) +1 //2 O _(2) to H _(2) O , Delta H- 280 KJ at 400 K is

    A
    700 J/g/K
    B
    700 KJ/mol/J
    C
    700 J/mol/K
    D
    `0.7J//mol//K`

  • If S + O_(2) rarr SO_(2), Delta H = -398.2 kJ , SO_(2) + (1)/(2) O_(2) rarr SO_(3), Delta H = -98.7 kJ SO_(3) + H_(2)O rarr H_(2)SO_(4), Delta H = -130.2 kJ , H_(2) + (1)/(2) O_(2) rarr H_(2)O, Delta H = -227.3 kJ The heat of formation of CS_(2(g)) is :

    A
    `+125 kJ mol^(1)`
    B
    `31.25 kJ mol^(-1)`
    C
    `62.5 kJ mol^(-1)`
    D
    `250 kJ mol^(-1)`

  • 2C_((s)) + 1/2O_(2(gg) rarr CO_(2(g)) , DeltaH = -787 KJ H_(2(g)) + 1/2O_(2(g)) rarr H_2O_((l)) , DeltaH = -286 KJ C_2H_(2(g)) + 2 1/2O_(2(g)) rarr 2CO_(2(g)) + H_2O_((l)) , DeltaH = -1301 KJ . Heat of formation of acetylene in KJ is

    A
    `-1802`
    B
    `+1802`
    C
    `-800`
    D
    `+228`

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