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The number of moles of NH(3), that must ...

The number of moles of `NH_(3)`, that must be added to 2L of 0.80M `AgNO_(3)` in order to reduce the concentration of `Ag^(+)` ions to `5.0xx10^(-8)M` (`K_("formation")` for `[Ag(NH_(3))_(2)]^(+)=1.0xx10^(8)`) is ______________.(Nearest integer)
[Assume no volume change on adding `NH_(3)`]

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