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200g 8% + 300g 10% = c%
200 * 0,08 + 300 * 0,1 = 200+300 * C%
16 + 30 = 500 * C%
46 = 500 * C%
500 * C% = 46
C% = 0,092 = 9,2%
II metoda.
200g 8% + 300g 10% = c%
mr1 = 200g
Cp1 = 8%
mr2 = 300g
Cp2 = 10%
mr3 = 200+300=500g
Cp3=?
Cp1=ms1/mr1*100%
ms1 = mr1*Cp1/100%
ms1 = 200*8/100%
ms1 = 16g substancji
Cp2 = ms2/mr2*100%
ms2 = mr2*Cp2/100%
ms2 = 300*10/100%
ms2 = 30g substancji
ms3 = 16+30 = 46g substancji
Cp3 = ms3/mr3*100%
Cp3 = 46/500 * 100%
Cp3 = 9,2%