The average SF bond energy in of is (Rounded off to the nearest integer).

[Given: The values of standard enthalpy of formation of , and are , and respectively.]

Question

The average SF bond energy in  of  is  (Rounded off to the nearest integer).

[Given: The values of standard enthalpy of formation of ,  and  are ,  and  respectively.]

Canvas Classes · Accepted Answer

Strategy:
 The total energy required to dissociate  into gaseous atoms is exactly the sum of its 6  bonds. Solve for atomization enthalpy, then divide by 6.

Step 1: Calculate

.

Step 2: Calculate average bond energy
.
Nearest integer: .

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