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masa roztworu (mr) - 40g + 260g = 300g
stężenie roztworu (Cp) - ?
Cp = ms*100% / mr
Cp = 40g*100% / 300g
Cp ≈ 13,3%
ms-40g
mr=300 (260+40=300)
Szukane:
Cp=?
300-100%
40 - x
________
300x=100* 40
300x=4000/300
x=13,3
Stezenie procentowe wynosi 13,3