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Calculate the weight of CaO required to ...

Calculate the weight of `CaO` required to remove hardness of `10^(6) L` of water containing `1.62 g` of `Ca (HCO_(3))_(2)` in `1.0 L`.
`(Mw of Ca (HCO_(3))_(2) = 162, mw of CaO = 56)`

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