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What is the molar mass of acetic acid (HC2H3O2)?

(NOTE: H = 1.008 amu, C = 12.011 amu, O = 15.999 amu)

120.1 g/mol
30.0 g/mol
58.0 g/mol
60.0 g/mol

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Answer:

Molar mass of acetic acid is 60 g/mol

Explanation:

Look at the formula:

CH₃COOH

We have:

  • 2 moles of C → 12.011 amu . 2 = 24 g/mol
  • 4 moles of H →  1.008 amu . 4 = 4 g/mol
  • 2 moles of O → 15.999 amu . 2 = 32 g/mol

Let's sum the mass of each element

24 g/mol + 4 g/mol + 32 g/mol = 60 g/mol

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