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When a current is passed through a solution of salt water, sodium chloride decomposes according to the following reaction:

2NaCl + 2H2O → 2NaOH + Cl2 + H2.

Using the periodic table, what are the molecular masses of the starting and ending substances?

NaCl = g/mole
A 58.44
B 35.45
C 22.9

Cl2 = g/mole
A 35.45
B 70.90

Respuesta :

aencabo
The answers are the following:
1.B 35.45
2.B 70.90

Answer:

For NaCl: The correct answer is Option A.

For [tex]Cl_2[/tex] : The correct answer is Option B.

Explanation:

Molar mass is defined as the sum of the mass of all the atoms each multiplied its atomic masses that are present in the molecular formula of a compound. It is expressed in g/mol.

For the given chemical reaction:

[tex]2NaCl+2H_2O\rightarrow 2NaOH+Cl_2+H_2[/tex]

The reactants are [tex]NaCl\text{ and }H_2O[/tex]

The products are [tex]NaOH,Cl_2\text{ and }H_2[/tex]

We know that:

Molar mass of Sodium = 22.99 g/mol

Molar mass of Chlorine = 35.45 g/mol

For starting substance NaCl:

Molar mass of NaCl = [tex][(1\times 22.99)+(1\times 35.45)]=58.44g/mol[/tex]

Hence, the correct answer is Option A.

For starting substance [tex]Cl_2[/tex] :

Molar mass of [tex]Cl_2=(2\times 35.45)=70.90g/mol[/tex]

Hence, the correct answer is Option B.

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