In chemistry calculations, knowing the molar mass of Chlorine is essential for stoichiometry and gas law problems.
Always use 71 g/mol for Cl₂ (gas) in reactions, but 35.5 g/mol for a single Cl atom in ionic calculations.
Chlorine has two naturally occurring isotopes:
Weighted average = (35 × 75 + 37 × 25) / 100 = (2625 + 925) / 100 = 35.5 g/mol
Moles = Mass / Molar mass = 142 / 71 = **2 moles** of Cl₂
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