Respuesta :
The mass formed in a chemical reaction is given by stoichiometry law in balanced chemical equation. The mass of silver produced in the reaction is 107. 9 g.
What is the stoichiometric law?
The stoichiometric law states that in a balanced chemical equation, the stoichiometric coefficient describes the moles of each compound in a chemical reaction.
The balanced chemical equation for the reaction is:
[tex]\rm Cu\;+\;2\;AgNO_3\;\rightarrow\;Cu(NO_3)_2\;+\;2\;Ag[/tex]
From the balanced chemical equation, 1 moles of copper results in 2 moles of silver.
Moles in terms of mass can be given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}[/tex]
Thus, moles of 31. 75 grams copper is:
[tex]\rm Cu=\dfrac{ 31. 75 }{63.5}\;mol\\ Cu=0.5 mol[/tex]
The moles of Ag produced can be given from stoichiometric law as:
[tex]\rm 1\;mol\;Cu=2\;mol\;Ag\\0.5 \;mol\;Cu=0.5\;\times\;2\;mol\;Ag\\0.5\;mol\;Cu=1\;mol\;Ag[/tex]
The moles of Ag produced is 1 mol.
The mass of a mole of element is equivalent to the molar mass. Thus, the mass of Ag produced in the reaction is 107. 9 g. Hence, option B is correct.
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