Question

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

Answer 1

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

Answer 2

Answer:

For NaCl: The correct answer is Option A.

For $Cl_2$ : 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:

$2NaCl+2H_2O\rightarrow 2NaOH+Cl_2+H_2$

The reactants are $NaCl\text{ and }H_2O$

The products are $NaOH,Cl_2\text{ and }H_2$

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 = $[(1\times 22.99)+(1\times 35.45)]=58.44g/mol$

Hence, the correct answer is Option A.

For starting substance $Cl_2$ :

Molar mass of $Cl_2=(2\times 35.45)=70.90g/mol$

Hence, the correct answer is Option B.