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2. SO2+H2O--->H2SO3
3. H2SO3--->(nad strzałką H2O) 2H+ +SO3 2-
X- H2O (woda)
Y- H2SO3 (kwas siarkowy(IV))
Z- SO3 2- (anion siarczanowy(IV))
U- S (siarka)
W- O2 (tlen)
1. P4+5O2--->P4O10
2. P4O10+6H2O--->4H3PO4