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cp= 50%
d = 1,3g/cm³
m = d * V
m = 1,3 g/cm³ * 300cm³
m = 390g
390g - 100%
x - 50%
x = 195g
x - 100%
195g - 68%
x = 286,76g
390g - 286,76 = 103,24g