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Mole Calculations 1

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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 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

AatomelementCu 6.02 x 1023 atoms/mole

MmoleculecovalentCH4 6.02 x 1023 molecules/mole

FFormula UnitionicNaCl 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

4. Convert 28 moles NaCl to Formula Units

x 6.02 x 1023 FU

28 moles

= 1.7 x 1025 FUs

1mole