Can anyone please explain this chemistry problem to me?

Posted on 2016-04-04 18:40:00 in Chemistry by LILLY

Silver tarnishes in the presence of oxygen and hydrogen sulfide according to the following equation: 

4Ag (s) + 2Hâ‚‚S (g) + Oâ‚‚ (g) → 2Agâ‚‚S (s) + 2Hâ‚‚O (l) 
Usually, Hâ‚‚S is the limiting reactant. If a silver spoon is placed in a container that holds 56.7 mL of Hâ‚‚S at 1.23 atm and 22 °C, how many grams of silver on the spoon will tarnish?

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