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Q.

The standard heat of formation of  U3O8  is  -853.5 kcal/mol  and the standard heat of the reaction3UO2+O2→ U3O8  is  -76.01 kcal.The standard heat of formation of UO2  is

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a

-1083 kJ mol-1

b

-108.3 kJ mol-1

c

-10.83 kJ mol-1

d

-1.083 kJ mol-1

answer is A.

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Detailed Solution

3UO2+O2→ U3O8 ∆H0=∆Hf0U3O8 -∆Hf0O2-3∆Hf0 -76.01 = -853.5 -0 -3∆Hf (UO2) or       ∆Hf0UO2 = -76.01 +-853.5-03 =-259.17  =-1083.33 kJ/mol
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