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ms-20%
ms=60g
28%=60+x/300+x *100%
8400+28x=6000+100x
2400=72x
x≈33,3g NaCl
cp = (60g + m)*100%/(300g + m )
(300g+m)28% = (60g+m)*100%
8400 + 28m = 6000 = 100m
100m – 28m = 8400 -6000
72m = 2400
m= 2400/72 = 33,33g
należy dosypać 33,33 g chlorku sodu