What mass of salt (nacl) should you add to 1.42 l of water in an ice cream maker to make a solution that freezes at -11.2 ∘c ? assume complete dissociation of the nacl and density of 1.00 g/ml for water?

The mathematical expression for depression in freezing point is given as:

where,

= depression in freezing point

= molal depression constant ()

m = molality

i = Van't Hoff factor

=

=

Now, put the values in formula,

   (as sodium chloride dissociate into two ions, i =2)

m =

=

Now, molality of the solution =

Number of moles  =

Molar mass of sodium chloride = 58.44 g/mol

molality of the solution =  (1 L = 1kg)

6.02 m =

mass in g =  

=

Thus, mass of sodium chloride is

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the child is heterozygous

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