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Pure liquid HCl has a density of 1.17 g/cc. What is its molarity? (Molar mass HCl = 36.5 g/mol)

1. 32.05 M
2. 36.5 M
3. 18.25 M
4. 42.10 M

Correct answer: 32.05 M

Solution

Pure HCl: 1 L weighs 1170 g, giving 1170/36.5 = 32.05 mol, so molarity is about 32 M.

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