a solution weighing 200g contains 69g NaOH determine molality
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The atomic masses of Mg and Cl are 24 g/mol and 35.5 g/mol respectively.
The molar mass of MgCl2=24+2(35.5)=24+71 g/mol.
The number of moles of MgCl2=Molar massMass=(24+71)200
The molality of MgCl2 is the ratio of the number of moles of MgCl2 present in 1 kg of water.
We have (24+71)200 moles of MgCl2 present in 1 kg of water.
Hence, the molality is (24+71)200
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