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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 )

Text Solution

Verified by Experts

The correct Answer is:
2.63
`DeltaT_(f)=0.3^(@)C," "DeltaT_(f)=iK_(f)m`
`rArr" "0.3=2xx3xx(W)/(58.5)xx(1000)/(900)" "rArr" "w=(0.3xx58.5xx900)/(6xx1000)=(157.95)/(60)=2.63g`
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