krioira 1. Mr(K3PO4)=3*39+31+4*16=212
W(K)=117/212=0.55=55%
W(P)=31/212=0.15=15%
W(O)=64/212=0.30=30%
2. W(C)=92.3%=0.923
    W(H)=7.7%=0.077
    Mr(стирола)=104

0.923*104=96
96/12=8 (C)

0.077*104=8
8/1=8(H)

Формула: С8Н8