how can it be fixed? what other elements have the same confusion?
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Chlorine gas is diatomic, meaning that in its 'natural' state it is bonded to another Cl. So 1 mol could refer to 1 mol of Cl2 or 1 mol of Cl. If it was specified that one was to measure Chlorine gas, there would be no problems.
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Math is correct and gets a point.
Other polyatomic elements are: H2, F2, Br2, I2, O2, S8, Se8, N2, P4, and As4.
Other polyatomic elements are: H2, F2, Br2, I2, O2, S8, Se8, N2, P4, and As4.