The theoretical yield of the Hg is 4.02 g.
What s the theoretical yield?
The theoretical yield is the yield that is obtained from the stoichiometry of the reaction.
The reaction equation is; 2HgO(s) ------> 2Hg(l) + O2(g)
Number of moles of HgO = 4.37 g/217 g/mol = 0.02 moles
Number of moles of Hg = 3.21 g/201 g/mol = 0.012 moles
Now;
Theoretical yield of Hg = 0.02 moles * 201 g/mol = 4.02 g
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