1. MOLE CONVERSIONS

2. Remember…..
1 mole =
6.02 x 1023 atoms of element/molecules of chemical compound
Atomic mass of element
Formula mass of a compound

3. Example 1:
Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?
0.25 mole Ca
1.5 x 1023 atoms Ca

4. Example 2:
86.2 grams C2H4. How many moles of C2H4? How many molecules?
3.08 moles C2H4
1.85 x 1024 molecules C2H4

5. Formula Mass Sum of atoms/ions’ masses in a chemical formula.
Molecular mass—
Refers to the sum of atom masses in a molecular formula.

6. Example 1:
NaCl

7. Example 2:
Which of the following contains the same number of atoms as 4.032g of hydrogen atoms?
1 mole of H2
6.022 x1023 moles of H
6.022 x 1023 moles of H2
(2)(6.022x1023) moles of H2 D

8. Practice
C22H24N2O8 (tetracycline)
2) C5H8NNaO4 (MSG)