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![S= SO_{2} =SO_{3}= H_{2} SO_{4} S= SO_{2} =SO_{3}= H_{2} SO_{4}](https://tex.z-dn.net/?f=S%3D+SO_%7B2%7D+%3DSO_%7B3%7D%3D+H_%7B2%7D+SO_%7B4%7D)
1)![S+ O_{2} =SO_{2} S+ O_{2} =SO_{2}](https://tex.z-dn.net/?f=S%2B+O_%7B2%7D+%3DSO_%7B2%7D+)
2)![2SO_{2} + O_{2} = 2SO_{3} 2SO_{2} + O_{2} = 2SO_{3}](https://tex.z-dn.net/?f=2SO_%7B2%7D+%2B+O_%7B2%7D+%3D+2SO_%7B3%7D+)
3)![SO_{3} + H_{2} O= H_{2} SO_{4} SO_{3} + H_{2} O= H_{2} SO_{4}](https://tex.z-dn.net/?f=+SO_%7B3%7D+%2B+H_%7B2%7D+O%3D+H_%7B2%7D++SO_%7B4%7D+)
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![P= P_{2} O_{3} =P_{2} O_{5} = H_{3} PO_{4} P= P_{2} O_{3} =P_{2} O_{5} = H_{3} PO_{4}](https://tex.z-dn.net/?f=P%3D+P_%7B2%7D++O_%7B3%7D+%3DP_%7B2%7D++O_%7B5%7D+%3D+H_%7B3%7D++PO_%7B4%7D+)
1)![P+3 O_{2} =2 P_{2} O_{3} P+3 O_{2} =2 P_{2} O_{3}](https://tex.z-dn.net/?f=P%2B3+O_%7B2%7D+%3D2+P_%7B2%7D++O_%7B3%7D+)
2)![P_{2} O_{3} + O_{2} =P_{2} O_{5} P_{2} O_{3} + O_{2} =P_{2} O_{5}](https://tex.z-dn.net/?f=P_%7B2%7D++O_%7B3%7D+%2B+O_%7B2%7D+%3DP_%7B2%7D++O_%7B5%7D+)
3)![P_{2} O_{5}+3 H_{2} O=2 H_{3} PO_{4} P_{2} O_{5}+3 H_{2} O=2 H_{3} PO_{4}](https://tex.z-dn.net/?f=P_%7B2%7D+O_%7B5%7D%2B3+H_%7B2%7D+O%3D2+H_%7B3%7D++PO_%7B4%7D+)
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