Объяснение:

Na3P M=23+23+23+31=100

w(Na)=23•3•100%/100=69%

w(Р)=31•100%/100=31%

PСl5 M=31 +35.5•5=208.5

w(Cl)=35.5•5•100%/208.5=85%

w(Р)=31•100%/208.5=15%

P2O5 M=16•5+31•3=142

w(O)=16•5•100%/142=56%

w(Р)=31•2•100%/142=44%

H3P M=1•3+31=34

w(H)=1•3•100%/34=9%

w(Р)=31•100%/134=91%