Ответы на вопрос:
1.h2+s=h2s↑ 2.2h2s+3o2=2h2o+2so2↑ 3.so2+na2o=na2so3 4.na2so3+cacl2=caso3↓+2nacl 5.caso3+2hcl=cacl2+h2o+so2↑ 6.2so2+o2=2so3 7.so3+h2o=h2so4
S+h2=h2s h2s+o2=so2+h2 so2+na2o=na2so3 na2so3+ca=caso3+2na caso3=so2+cao 2so2+o2=2so3 so3+h2o=h2so4
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