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100 mL of a water sample contains 0.81g ...

100 mL of a water sample contains 0.81g of calcium bicarbonate and 0.73g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalent of `CaCo_3` is `10^x` ppm. What is numerical value of x? (molar mass of calcium bicarbonate is `162 gmol^(-1)` and magnesium bicarbonate is `146g mol^(-1))`

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