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Q.

Enthalpies of combustion of diamond and amorphous carbon are -94.3K.cal and -97.6K.cal respectively. Calculate the enthalpy change when 2g of diamond converted into amorphous form in K.cal

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a

3.3 K.cal

b

4.4 K.cal

c

0.55 K.cal

d

0.22 K.cal

answer is C.

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Detailed Solution

Cd+O2→CO2(g);ΔH1=-94.3K.calCa+O2→CO2(g);ΔH2=-97.6K.calCd→Ca;ΔH=ΔH1-ΔH2=-94.3-(-97.6)=3.3K.calmol-1For 12 g -------- 3.3 K.cal2×3.312=0.55K.cal 2g -------  ?
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