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92 gm mixture of CaCO(3) "and" MgCO(3) w...

92 gm mixture of `CaCO_(3) "and" MgCO_(3)` was heated strongly in an open vessel. After complete decomposition of the carbonates it was found that the weight of residue left behind is 48g. Find the mass of `MgCO_(3)` in grams in the mixture.

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