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d=1,07g/cm3
m=150g
v=m/d
v=150/1,07
v=140,19cm3
Z def. stęż. molowego
2mole Na3PO4-----1000cm3
xmoli Na3PO4------140,19cm3
x=0,28mola Na3PO4
mNa3PO4=164u
164g Na3PO4------1mol
xg Na3PO4---------0,28mola
x=45,9g Na3PO4
Zad.2
a)
Masa molowa H2SO4=98u
d=1,14g/cm3 = 1140g/dm3
Cm=2mol/dm3
Cp=Cm*100%*M/d
Cp=2*100*98/1140
Cp=17,2%
b)
Masa molowa HNO3=63u
d=1,08g/cm3 = 1080g/dm3
Cm=2mol/dm3
Cp=Cm*100%*M/d
Cp=2*100*63/1080
Cp=11,7%
Większe stężenie procentowe posiada kwas siarkowy(VI)