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How much energy will be released when a ...

How much energy will be released when a sodium ion and a chloride ion, originally at infinite distance are brought together to a distance of 2.76Ã… (the shortest distance of approach in a sodium chloride crystal)? Assume that ions act as point charges, each with a magnitude of `1.6xx10^(-19)C`.
Permittivity constant of the medium is `9xx10^(9)Nm^(2)C^(-2)`.

Text Solution

Verified by Experts

Energy released
`=-K(q_(1)q_(2))/(r)`
`=-(9xx10^(9)xx(1.6xx10^(-19))^(2))/(2.76xx10^(-10))=-8.35xx10^(-19)J`.
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