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15. An X molal solution of a compound in benzene hasmole fraction of solute equal to 0.2. The value of X is:-(1) 14 (2) 3.2 (3) 1.4 (4)2 |
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Answer» mol fraction of solute=0.2hence mol fraction of benzene=1-0.2=0.8it means that 0.8 mol of benzene contains 0.2 mol of solute.................⇒0.8*78g of benzene contains 0.2 moles of solute⇒ 62.4g.................................0.2mol...............⇒1g......................................(0.2/62.4)mol.......hence 1000g of benzene would contain (1000/62.4)*0.2 mol of solute=3.2=molality of solute=x |
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