The balanced equation :
4Ag(s)+ 2H₂S(g)+ O₂(g) ⇒2Ag₂S(s)+ 2H₂O(I)
Further explanation
Given
Reaction
Ag(s)+ ___H2S(g)+___ O2(g) --> ___Ag2S(s)+___ H2O(I)
Required
Balanced equation
Solution
Give a coefficient
aAg(s)+ bH₂S(g)+ cO₂(g) ⇒Ag₂S(s)+ dH₂O(I)
Make an equation
Ag, left=a, right=2 ⇒ a=2
S, left=b, right=1 ⇒b=1
H, left=2b, right=2d ⇒2b=2d ⇒2.1=2d ⇒d=1
O, left=2c ⇒right=d ⇒2c=d ⇒2c=1 ⇒c=1/2
The equation becomes :
2Ag(s)+ H₂S(g)+ 1/2O₂(g) ⇒Ag₂S(s)+ H₂O(I) x2
4Ag(s)+ 2H₂S(g)+ O₂(g) ⇒2Ag₂S(s)+ 2H₂O(I)