The balanced equation is
Ag2S (s) + 2 HCl (aq) -----> 2 AgCl (s) + H2S (g)
Number of moles of Ag2S = 683 g / 247.8 g/mol = 2.76 mol
From the balanced equation we can say that
1 mole of Ag2S produces 2 mole of AgCl so
2.76 mole of Ag2S will produce
= 2.76 mole of Ag2S *(2 mole of AgCl / 1 mole of Ag2S)
= 5.52 mole of AgCl
mass of 1 mole of AgCl = 143.32 g
so the mass of 5.52 mole of AgCl = 791 g
Therefore, the mass of AgCl produced would be 791 g
From the balanced equation we can say that
1 mole of Ag2S produces 1 mole of H2S so
2.76 mole of Ag2S will produce
= 2.76 mole of Ag2S *(1 mole of H2S /1 mole of Ag2S)
= 2.76 mole of H2S
mass of 1 mole of H2S = 34.1 g
so the mass of 2.76 mole of H2S = 94.1 g
Therefore, the mass of H2S produced would be 94.1 g
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