Question

(g) x - y - x2 + y2
(h) (x+
k) 25
2
1,2

Answer 1

Answer:

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Step-by-step explanation:

Solution:- (C) 800kJ/mol

Given that the bond dissociation energy of XY,X

2

and Y

2

are in the ratio 1:1:0.5.

Let the bond energy of XY,X

2

and Y

2

be 2x,2x and x respectively.

2

1

X

2

+

2

1

Y

2

⟶XY;ΔH=−200kJ/mol

For the above reaction,

ΔH=∑B.E.

(reactant)

−∑B.E.

(product)

⇒−200=(

2

1

×2x+

2

1

×x)−(2x)

⇒−200=

2

3

x−2x

⇒x=(−200)×(−2)=400

Therefore,

Bond dissociation energy of X

2

=2×400=800kJ/mol

Hence the bond dissociation energy of X

2

is 800kJ/mol.