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The element sulfur, S(s), contains 6.022 x 1023 S atoms/mole.

The compound carbon dioxide, CO2(g), contains 6.022 x 1023 CO2 molecules/mole .

The compound bromine, Br2(l), contains 6.022 x 1023 Br2 molecules/mole.

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S(s) = 32.066 g/mol

Br2(l) = 159.808 g/mol

CO2(g) = 44.010 g/mol

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S(s) 16 cm3/mol

Br2(l) 51 cm3/mol

CO2(g) 2 x 104 cm3/mol

At room temperature and pressure:

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sulfur atoms, S atomic weight = 32.066 32.066 g S/mol S

bromine molecules, Br2

atomic weight = 79.904 molecular weight159.808 159.808 g Br2/mol Br2

carbon dioxide molecules, CO2

atomic weights

carbon 12.011, oxygen 15.9994molecular weight 44.010

44.010 g CO2/mol CO2

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1.Convert 30 g carbon to moles.

C: atomic weight 12.011

12.011 g C/mol C

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mass (g) carbon moles carbon

(Convert 30 g C to mol.)

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(Convert 30 g C to mol.)

30 g C

1 12.011

x _________mole C g C

30 mole C12.011

= 2.5 mol C

2. Convert 3.5 liters of ammonia at S.T.P. to moles.  

volume (L) ammonia

moles ammonia

22.414 L/mole NH3(g)

(at S.T.P.)

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(Convert 3.5 L NH3 at S.T.P. to mol.)

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___________

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(Convert 3.5 L NH3 at S.T.P. to mol.)

3.5 L NH3

x

3.5 mol NH3 22.414

= 0.16 mol NH3

mol NH3

L NH3

1 22.414

M (molar) = mol solute/L solution

0.5 M glucose = 0.5 mol glucose/1 L soln

3. How many moles of glucose are in 10 mL of a 0.5 molar aqueous solution?

volume (mL) solution volume (L) solution moles solvent

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(# mol glucose in 10 mL 0.5 M soln?)

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10 mL solution

x 1 1000or10 mL solution x 1 L 103 mL

or

10 mL solution x 10-3 L 1 mL

______ LmL

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(# mol glucose in 10 mL 0.5 M soln?)

10 mL solution x 1 L 1000 mL

or 10 mL solution x 1 L 103 mL

or 10 mL solution x 10-3 L 1 mL

x mol glucose L solution

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x mol glucose L solution

x mol glucose L solution

0.5 1

0.5 1

0.5 1

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(# mol glucose in 10 mL 0.5 M soln?)

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10 mL solution x 1 L x 0.5 mol glucose 1000 mL 1 L solution

or

10 mL solution x 1 L x 0.5 mol glucose 103 mL 1 L solution

or

10 mL solution x 10-3 L x 0.5 mol glucose 1 mL 1 L solution

(# mol glucose in 10 mL 0.5 M soln?)

10 x 0.5 mol glucose 1000or10 x 0.5 mol glucose 103

or10 x 10-3 x 0.5 mol glucose

= 0.005 or 5 x 10-3 mol glucose

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(# mol glucose in 10 mL 0.5 M soln?)

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4. How many atoms are

present in 4.0 moles of phosphine, PH3? 

4.0 atoms/molecule PH3

moles phosphine molecules phosphine atoms

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(# atoms in 4.0 mol PH3?)

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4.0 mol PH3x 6.02 x 1023

1

x atoms molecule PH3

4 1

molecules PH3 mol PH3

_____________________

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(# atoms in 4.0 mol PH3?)

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4.0 mol PH3 x 6.02 x 1023 molecules PH3

1 mol PH3

x 4 atoms 1 molecules PH34.0 x 6.02 x 1023 x 4 atoms

= 9.6 x 1024 atoms

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(# atoms in 4.0 mol PH3?)

5. How many electrons are lost by ionization of 0.65 moles of calcium?

Ca Ca 2+ + 2e

moles calcium atoms calcium electrons

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(# electrons lost by 0.65 mol Ca?)

x electrons atom Ca

0.65 mol Ca x __________________atoms Ca mol Ca

6.02 x 1023

1

21

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(# electrons lost by 0.65 mol Ca?)

0.65 x 6.02 x 1023 x 2 electrons= 7.8 x 1023 electrons

END OF TUTORIAL

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0.65 mol Ca x 6.02 x 1023 atoms Ca 1

mol Ca x 2 electrons

1 atom Ca

(# electrons lost by 0.65 mol Ca?)

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