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The molar heats of combustion of C2H2(g)...

The molar heats of combustion of `C_2H_2(g),C(graphite)` and `H_2(g)` are -310.62, -94.05, -68.32 kcal respectively. The heat of formation of acetylene Is

A

54.2 kcal

B

-54.2 kcal

C

-68.32 kcal

D

`+68.32 kcal`

Text Solution

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The correct Answer is:
B
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Molar heats of combustion of C_(2)H_(2)(g), C (graphite) and H_(2)(g) " are " -310.62 " kcal ", -94.05 " kcal " and -68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

Standard heat of formation of C_2H_6(g),CO_2(g) and H_2O(l) are -21.1,-94.1 and -68.3 Kcal mol^(-1) respectively calculate standard heat of combustion of C_2H_6(g)

Knowledge Check

  • The standard heat of formation of NO_2(g) and N_2O_4(g) are 8.0 and 2.0 kcal mol^-1 respectively. The heat of dimarization of NO_2 in kcal is:

    A
    10
    B
    -6
    C
    -12
    D
    -14

  • The heats of combustion of methane,carbon and hydrogen are a,b and c calories respectively what will be heat of formation of CH_4 ?

    A
    (a+c)-(a+b)
    B
    (b+c)+(c-a)
    C
    a+b+c
    D
    ((a+b)/2)-c

  • At 25^(@)C , the standard heats of formation of H_(2)O(g),H_(2)O_(g),H(g) and O(g) are -241.8, -135.66, 218 and 248.17kJ*mol^(-1) respectively. The bond energy (in kJ*mol^(-1) ) of O-O bond in H_(2)O_(2)(g) molecule is-

    A
    179.23
    B
    160.19
    C
    142.6
    D
    157.16

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