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mrozp.=1,8kg
mr=1,8+0,2=2
cp=ms/mr*100%
cp=0,2/2*100%
cp=10%
mr (masa roztworu) =0,2kg+1,8kg= 2kg
cp (stężenie procentowe) =ms*100%/mr
cp= 0,2kg*100%/2kg= 10%
pozdrawiam;)