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Q.

G0 of graphite and diamond respectively are zero and 2.9 kJ/mole. Gibbs energy change for producing 24g diamond from graphite in kilo joules is

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a

+5.8

b

+2.9

c

-2.9

d

-5.8

answer is C.

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Detailed Solution

Graphite\rightarrowDiamond

\begin{array}{l} \Delta G = G_{diamond}^0 - G_{graphite}^0\\ \,\,\,\,\,\,\,\,\, = 2.9 - 0 = 2.9KJ/mole \end{array}

For  12gm ,    ΔG = 2.9KJ

       24gm      ΔG = ?

                      = 2.9\times \frac{24}{12}=5.8KJ

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