Answer
$1.85\ kg$
Work Step by Step
Number of moles of $Cu_2S$:
$3000.\ g\div 159.15\ g/mol= 18.85\ mol$, same as sulfuric acid from stoichiometry.
Theoretical yield:
$18.85\ mol \times 98.07\ g/mol= 1848.7\ g=1.85\ kg$
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