Answer :

The molar mass of chlorine gas is 35.5 g/mol. The correct option is A.

Molar mass is defined as the mass of one mole of a substance and is expressed in grams per mole (g/mol). The atomic mass of chlorine is 35.5 g/mol as it has an atomic number of 17 and a mass number of 35.5. Chlorine exists as a diatomic gas, which means that two atoms of chlorine combine to form one molecule of chlorine gas (Cl2).

Therefore, the molar mass of chlorine gas is twice the atomic mass of chlorine, which is 35.5 g/mol. This makes the molar mass of chlorine gas equal to 2 x 35.5 g/mol = 71 g/mol approximately.

Option B is close to the correct answer, but not exactly the same, whereas options C and D are both incorrect as they are too high and do not make sense in the context of molar mass. In conclusion, the molar mass of chlorine gas is 35.5 g/mol, which is the correct answer out of the given options.

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