Question

$11346 = 3x2 = 3 \frac{3 = 3}{?}$
​

Answer 1

Answer:

Correct option is

A

−226 and +467

N

2

+3X

2

→2NX

3

Energy to break 1 mole of N

2

bond =941 kJmol

−1

Energy to break 3 mole of F

2

bond =3×155 kJ mol

−1

Energy released caused of bond formation of 2 moles of 3 bonds N−F=2×3×272

Heat of formation of NF

3

by Hess law =941+3×155−(2×3×272)=−226 kJ mol

−1

Similarly for NCl

3

,

Just replacing the necessary values in previous calculations, heat of formation of NCl

3

=941+3×242−(2×3×200)=+467 kJmol

−1

.

Hence, option A is correct.

Step-by-step explanation:

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