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# Mole Calculations 1 - PowerPoint PPT Presentation

Mole Calculations 1. Chemical Calculations. Atoms and molecules are extremely small. If they are so small and so light, how can we weigh them?. We weigh large numbers of them. 1.00 g H = 6.02 x 10 23 atoms = 1.00 mole This is called Avogadro’s number.

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Atoms and molecules are extremely small.

If they are so small and so light, how can we weigh them?

We weigh large numbers of them.

1.00 g H = 6.02 x 1023 atoms = 1.00 mole

This is called Avogadro’s number

1 dozen donuts = 12 donuts

1 century = 100 years

1 millennium = 1000 years

1.00 mole = 6.02 x 1023 particles

TThe mole is a large number of particles

pparticle

Aatom element Cu 6.02 x 1023 atoms/mole

Mmolecule covalent CH4 6.02 x 1023 molecules/mole

FFormula Unitionic NaCl 6.02 x 1023 FUs/mole

1. Convert 2.5 x 1025 at C to moles

2.5 x 1025 at C

x 1 mole

= 42 moles C

6.02 x 1023 at C

2. Convert 16.3 moles CO2 to molecules

16.3 moles

x 6.02 x 1023 molecules

= 9.81 x 1024 molecules

1mole

3. Convert 8.9 x 1024 molecules CO2 to moles

x 1 mole

8.9 x 1024 molecules

= 15 moles CO2

6.02 x 1023 molecules

x 6.02 x 1023 FU

28 moles

= 1.7 x 1025 FUs

1mole