№5
ω(NaCl)=30/150=0.2
№4
ω(Na3PO4)=(0.08*40+0.05*20)/(40+20)=0.07 7%
№3
ω(глюкозы)=250*0,1/(250+150)=0.0625
№2
P2O5+3H2O=2H3PO4
m(P2O5)=0.1*142=14.2
m(H3PO4)=0.2*98=19.6
ω(H3PO4)=19.6/(100+14.2)=0.1716 17.16%
№1
CaCO3=CaO+CO2
n(CO2)=6.7/22.4=0.3
m(CaCO3)=0.3*100=30
ω(CaCO3)=30/35=0.857 85.7%