When the silver goblet was exposed to hydrogen sulfide and oxygen, 1.2 mol of silver sulfide formed. Silver sulfide tarnish appears black.
This means 1.2 x Avogadro's number molecules of silver sulfide formed. The formula for silver sulfide is Ag[2]S. The chemical formula of silver sulfide is Ag[2]S. Every molecule...
See This Answer Now
Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.
Already a member? Log in here.
When the silver goblet was exposed to hydrogen sulfide and oxygen, 1.2 mol of silver sulfide formed. Silver sulfide tarnish appears black.
This means 1.2 x Avogadro's number molecules of silver sulfide formed. The formula for silver sulfide is Ag[2]S. The chemical formula of silver sulfide is Ag[2]S. Every molecule of silver sulfide contains two silver atoms. So we must multiply the number of silver sulfide molecules by 2 to calculate the amount of silver consumed in the tarnishing reaction.
1.2 mol x 2 = 2.4 mol of silver was consumed in the following tarnishing reaction:
2 Ag(s) + H[2]S(g) ---> Ag[2]S(s) + H[2](g)
where (s) indicates the solid phase and (g) indicates the gas phase.
Tarnish can be removed physically, by scrubbing it off, or chemically by reacting with aluminum.