Question

la cafeina se disolvio 45.,0g de cloroformo para dar una solucion 0,0946m

Answer 1

molalidad = moles soluto / Kg de svte

Mm CHCl3 = 119.5 g/mol

Mol = masa /Mm

Mol = 45 g / 119.5 g/mol = 0.376 mol

0.0946 mol  =  0.376 mol

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           Kg              Kg svte.

 

Kg svte = 0.376 / 0.0946  = 3.974 Kg x 1000 = 3974 g