Respuesta :
Answer: The correct answer is option (B).
Explanation:
Law of conservation of mass: 'In a chemical reaction, mass neither be created nor be destroyed'
In the balance chemical equation,total mass of the reactants is equal to the total mass of the products.
A. [tex]2Na+Cl_2\rightarrow NaCl[/tex]
[tex][2\times (23 g/mol)+(35.5 g/mol)\times 2]=[23 g/mol+35.5 g/mol][/tex]
117 g/mol ≠ 58.5 g/mol
Law of Conservation of Mass not followed.
B.[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
[tex][2\times (23 g/mol)+(35.5 g/mol)\times 2]=2\times [23 g/mol+35.5 g/mol][/tex]
117 g/mol = 117 g/mol
Law of Conservation of Mass is followed.
C.[tex]2Na+2Cl_2\rightarrow 2NaCl[/tex]
[tex][2\times (23 g/mol)+(35.5 g/mol)\times 2]=2\times [23 g/mol+35.5 g/mol][/tex]
188 g/mol ≠ 117 g/mol
Law of Conservation of Mass not followed.
D.[tex]Na+Cl_2\rightarrow 2NaCl[/tex]
[tex][(23 g/mol)+(35.5 g/mol)\times 2]=2\times [23 g/mol+35.5 g/mol][/tex]
94 g/mol ≠ 117 g/mol
Law of Conservation of Mass not followed.
Hence, the correct answer is option (B).
