The tarnish that forms on objects made of silver is solid silver sulfide; it can be removed by reacting it with aluminum metal to produce silver metal and solid aluminum sulfide. How many moles of the excess reactant remain unreacted when the reaction is over if 6 moles of silver sulfide react with 10 moles of aluminum metal? Hint: Write a balanced chemical equation first. Enter to 1 decimal place. (MTS 12/21/2022)