2Na + S - > Na2S
H2S + 2Na - > Na2S + H2 (strzałka w górę)
Na2O + H2S - > Na2S + H2O
Zn(OH)2 + N2O5 - > Zn(NO3)2 +H2O
Zn + 2HNO3 - > Zn(NO3)2 + H2 (strzałka w górę)
Zn(OH)2 + 2HNO3 -> Zn(NO3)2 + 2H2O
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2Na + S - > Na2S
H2S + 2Na - > Na2S + H2 (strzałka w górę)
Na2O + H2S - > Na2S + H2O
Zn(OH)2 + N2O5 - > Zn(NO3)2 +H2O
Zn + 2HNO3 - > Zn(NO3)2 + H2 (strzałka w górę)
Zn(OH)2 + 2HNO3 -> Zn(NO3)2 + 2H2O