Answer to Question #294420 in General Chemistry for ririyery

Question

How much table salt should be added to 300 g water to lower its freezing point to -2.00°C? 

Answer 1

∆T_f = iK_fm

For water, K_f = 1.86⁰ c/kg/mol

i= 2

m= morality of solution.

-2=2x1.86x300÷1000xm

-2= 1.116m

m= 2÷1.116

=0.558

Mass= 0.558×58.5

=32.643