When a mixture of silver metal and sulfur is heated, black silver sulfide is formed. What mass of silver?
When a mixture of silver metal and sulfur is heated, black silver sulfide is formed. What mass of silver will produce 25.0 g of the product?
2Ag + S ———–> Ag2S [balanced equation]
Ag = 2 x 107.87 = 215.74
S = 1 x 32.06 = 32.06
thus…
molar mass of Ag2S = 247.8 g/mole
Number of moles in 25 grams = 25 grams/ 247.8 g/mole
= 0.1 mole of Ag2S in 25 grams
from the balanced equation…2 moles Ag needed to produce 1 mole Ag2S
thus 0.2 moles of Ag is needed to produce 0.1 mole Ag2S…
compute weight in grams of Ag present in 0.2 moles Ag.
Ag = 0.2 moles x 107.87 grams/mole = 21.574 grams Silver needed
Answer: 21.574 grams
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