Answer :
The molecular mass of chlorine is 71. Therefore, the correct answer is option C) 71.
The molecular mass of an element or a compound is the sum of the atomic masses of all the atoms in its chemical formula.
For chlorine (Cl), the atomic mass is given as 35.5. Since chlorine exists as a diatomic molecule in its standard state (Cl2), we need to add the atomic mass of two chlorine atoms to get the molecular mass.
Molecular mass of chlorine (Cl2) = 2 * atomic mass of chlorine = 2 * 35.5 = 71.
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