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cp=12%
d=1,5g/cm3
ms=???
mr= V * d
mr=25 * 1,5=37,5 (g)
cp= (ms/mr) * 100%, wiec po przeksztalceniu wzoru
ms= (cp * mr)/ 100%
ms= (12% * 37,5)/100%
ms=4,5 (g)
jakby cos bylo niejasne to pisz!!!