1.

For the allotropic change represented by equation C(diamond) rarr C(graphite), the enthalpy change is DeltaH=-1.89 kJ. If 6g of diamond and 6g of graphite are separately burnt to yield carbon dioxide, the heat liberated in the first case is

Answer»

Less than in the second case by 1.89 kJ
More than in the second case by 1.89 kJ
Less than in the second case by 11.34 kJ
More than in the second case by 0.945 kJ

Solution :`C_(("GRAPHITE"))rarrC_(("diamond")), DeltaH=-1.89 kJ`
`C_(("graphite"))+O_(2)rarrCO_(2), DeltaH=-DeltaH_(1)`
`C_(("diamond"))+O_(2)rarrCO_(2), DeltaH=-DeltaH_(2)`
`(-DeltaH_(1))-(-DeltaH_(2))=1.89 kJ` for 12 G `C_("Diamond")rarrC_("graphite")`
for combustion of 6g, `C_("Diamond")rarrC_("graphite") =-1.89//2=-0.945 kJ`.


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