Meaning of M (2) (st-42) How calculated one the molar mass 'M', z.B. Of water (H2O)?

  Exercise: st-42    

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How calculated one the molar mass 'M', z.B. Of water (H₂O)?

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Hinweis: Note: As the word molar mass already says… a Mol note.

Solution:

The periodicity system (PSE) is needed. Calculation z.B. For water, H₂O.

1. In the case of H it is on the PSE 1.00794 (g/mol), in the case of oxygen 15.9994 (g/mol).
   The I mean, thus, that a mol the mass of hydrogen atoms 1.00794 g, and by analogy a mol O-atoms 15.9994 g.
2. A (!) only water molecule is shown 2 hydrogen atoms and a oxygen atom on
3. A mol (!) water molecules to be wise thus 2 mol H-atoms and 1 mol O-atoms on.
4. The molar mass is thus calculated to 2·1.00794 + 1·15.9994 = 18.01528 g or rounded up to 18 g/mol.
5. In short: M(H₂O) = 18 g/mol

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