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The Born -Haber cycle for formation of r...

The Born -Haber cycle for formation of rubidium chloride `(RbCl)` is given below
(the enthalpies are in `K Cal mol"^(-1)` )

Find the value of X.

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The correct Answer is:
`-90.75" kCal mol"^(-1)`
`-105=20.5+96+28.75-159.5+x`
`x=-90.75" kCal mol"^(-1)`
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