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How much amount of NaCl in g should be a...

How much amount of NaCl in g should be added to900 g of water `( rho =1.00 g//mL` ) to decrease the freeezing point of water to `-0.3^(@)C` `"___________"` . ( The freezing point depression constant for water `= 3K kg mol^(-1)` Atomic mass `: ` H =1 , O =16,Na = 23 , Cl = 35.5 )

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`Delta T_(f) = 0.3^(@)C`, `DeltaT_(f) = iK_(f) m`
`rArr 0.3 = 2 xx3 xx (w)/(58.5) xx(1000)/( 900 ) rArr w = (0.3 xx 58.5 xx 900)/( 6 xx 1000) = (157.95)/( 60) =2.63g`
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