1. 5. a) b) X w =0.878 X ss =0.048 X =0.035 T i =0 ºC =273 K T f =14.6 ºC=287.6 K m=50 ml=0.050 L Kj C p =4.186 X w + 1.4 X ss +1.9 X g C p =4.186 ( 0.878)+1.4 ( 0.048 )+1.9 ( 0.03 C p =3.68+0.067 +0.07 C =3.82 Kj Q s =m×C p ×∆T Q s =( 0.050 ) × ( 3.82) ×( 273−287.6 ) Q s =−2.79 Kj t ic =−1.8 X w t ic =−1.8 ( 0.878 ) t =−1.58 t ic =−K w × C ´ M t ic =−18.6× 13.89 202.43 t ic =−1.28 C ´ = 1−X w X w × 100 C ´ = 1−0.878 0.878 × 100 C ´ =13.89 M= 200 1− 0.25 X ss M= 200 1− 0.25 ( 0.048) M=202.43
