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Calculeaza masa de potasiu din 8,5g clorura de potasiu de puritate 60 %

Răspuns :

p/100=mp/mi 60/100=mp/8,5 mp=60•8,5/100 mp=5,1g KCl MKCl=39+35,5=74,5g/mol 74,5 g KCl..........39 g K 5,1 g KCl.............x x=5,1•39/74,5 si calculezi asta