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Mr. 360g 4% roztworu
Ms- 14.4 g
Mw - 345,6g
A)
140*0.02=2,8
140-2,8=137.2
14,4g+2,8g/345,6+137,2*100=3,56%
B
14,4/345,6-40*100=4,7%
C
(14,4-10)/360-10=1,25%