Răspunsuri

2014-11-05T18:45:42+02:00
A) c= (md*100)/ ms = 500 * 100 /(1500 +500) = 50000:2000= 25 %
b) c= (md* 100)/ ms = 200 *100 ( masa solutiei,adica 200 +1800)= 20000 :2000= 10%