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Chemistry 20 Mole Conversions - PowerPoint PPT Presentation

Chemistry 20 Mole Conversions. What is a Mole?. A term of measurement A counting number Similar to saying 1 dozen = 12 things Avogadro's Number (N A ) 6.02 x 10 23 items A VERY LARGE NUMBER!!!. = 1 mole.

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Chemistry 20Mole Conversions

• A term of measurement

• A counting number

• Similar to saying 1 dozen = 12 things

• Avogadro's Number (NA)

6.02 x 1023 items

A VERY LARGE NUMBER!!!

= 1 mole

Mole Conversions size of Earth 1m deep in green peas

Molar Mass

Mass In Grams

Moles

g/mol

Molar Mass size of Earth 1m deep in green peas

• Molar mass is the mass of one mole in an element or compound

• Atomic mass tells us that the units are grams per mole g/mol

Examples:

Carbon, C = 12.01 g/mol

Phosphorus, P = 30.97 g/mol

Molar Mass Examples size of Earth 1m deep in green peas

What is the Molar Mass of:

Salt, NaCl:

Na = 22.99g/molCl= 35.45g/mol

NaCl = 22.99g/mol + 35.45g/mol = 58.44g/mol

Glucose, C6H12O6:

C6= 6(12.01g/mol) H12 = 12(1.01g/mol) O6 = 6(16.00g/mol)

C6H12O6= 6(12.01g/mol) +12(1.01g/mol) 6(16.00g/mol)

= 180.18 g/mol

Sodium bicarbonate, NaHCO size of Earth 1m deep in green peas3:

Na= 22.99g/mol H=1.01g/mol C=12.01g/mol

O = 3(16.00g/mol)

NaHCO3= 22.99g/mol + 1.01g/mol + 12.01g/mol + 3(16.00g/mol)

= 84.01g/mol

Mole Conversion Examples size of Earth 1m deep in green peas

A grade eleven chemistry student has 3.00 g of boron tribromide (BBr3). How many moles of BBr3 is this?

Molar mass of BBr3 = 10.81 + 3(79.90) = 250.51g/mol

3.00g BBr3 x1mole = 0.0120 mole BBr3

250.51g

REMEMBER SIG FIGS!

If I have 50.0g of calcium chlorate (CaClO size of Earth 1m deep in green peas3)2 how many moles do I have?

Molar Mass (CaClO3)2 =

2(40.08) + 2(35.45) + 6(16.00) = 247.06 g/mol

50.0g (CaClO3)2 x 1 mole = 0.202 mole (CaClO3)2

247.06g

Sig Figs

Determine the mass of size of Earth 1m deep in green peasthe following amount:

6.94 mol barium chloride (BaCl2)

Molar Mass BaCl2 = 137.33 + 2(35.45) = 208.23 g/mol

6.94 molBaCl2 x 208.23 g = 1.45 x 103 g BaCl2

1 mole

Remember only 3 sig figs

Chemistry 20 size of Earth 1m deep in green peasMole Conversions

Mole Conversions size of Earth 1m deep in green peas

Respective

Particles

Moles

6.02 x 1023 molecules or atoms or formula units

Mole Conversion Examples size of Earth 1m deep in green peas

If a chemist is experimenting with 5 700 000 000 atoms of lead how many moles is she dealing with?

Avogadro’s number = 6.02 x 1023 atoms

5 700 000 000 atoms Pb x 1 mole = 9.5 x 10-15mol

6.02 x 1023 atoms

2 sig figs

2 sig figs

How many moles is in 2.97 x 10 size of Earth 1m deep in green peas25 atoms of Vanadium?

2.97 x 1025 atoms of V x 1 mole

6.02 x 1023 atoms

= 49.3 moles of V

Determine the number of molecules in the following: size of Earth 1m deep in green peas

• 1.01 moles of bismuth

1.01 mol Bi x 6.02 x 1023 atoms

1 mole

= 6.08 x 1023atoms of Bi

b) 2.5 moles of size of Earth 1m deep in green peasmanganese

2.5 molMnx 6.02 x 1023atoms

1 mole

= 1.5 x 1024atoms of Mn

If the students in a chemistry 20 class have size of Earth 1m deep in green peas

7.66 x 1019 molecules of hydrogen peroxide, H2O2, how many moles do they have?

7.66 x 1019 molecules x 1 mole 6.02 x 1023 molecules

= 1.27 x 10-4 molecules of H2O2

Chemistry 20 size of Earth 1m deep in green peasMole Conversions

Mole Conversions size of Earth 1m deep in green peas

Litres of Gas at STP

Volume

Moles

22.4 L

Mole Conversion Examples size of Earth 1m deep in green peas

Determine the volume, in liters, occupied by 0.030 moles of helium gas at STP.

0.030 moles He(g) x 22.4L = 0.67 L of He(g)

1 mole

REMEMBER UNITS

What is the volume of 0.05 size of Earth 1m deep in green peasmol of neon gas at STP?

0.05 mol Ne x 22.4L = 1.12L of Ne(g)

1 mole

11.2L Ar(g) x 1 mole = 0.5 mole Ar(g)

22.4L

1.2 mol H2O(g) x 22.4L = 26.88L of H2O

1 mole

Chemistry 20 gas at STPMole Conversions

Mole Conversions gas at STP

Representative Particles

Volume at STP

x 6.02 x 1023particles

1 mole

X 22.4L

1 mole

x 1 mole

6.02 x 1023 particles

x 1 mole

22.4L

MOLE

x 1mole

molar mass

x molar mass

1mole

Mass

Mixed Mole Conversion gas at STP

• Write down the question’s the given and the unknown.

• Convert the given unit to number of moles.

• Convert the number of moles found to the unknown unit.

• Make sure the answer has the correct unit and number of sig figs.

Mole Conversion Examples gas at STP

Calculate the mass, in grams (g), of the following:

• 3.00L of O2(g)

3.00L of O2(g) x 1 mole x 32.00 g = 4.29 g O2(g)

22.4L 1mole

b) 15 atoms of gold

15 atoms Au(s) x 1 mole x 196.97g = 4.9 x 10-21 g Au

6.02 x 1023 atoms 1 mole

Calculate the number of atoms in 2.0L of SO gas at STP3 gas.

2.0LSO3(g)x 1 mole x 6.02 x 1023 atoms = 5.3 x 1022 atoms SO3

22.4 L 1 mole

3.25 x 105 molecules of CO2(g), how many litres do they have?

3.25 x 105molecules of CO2(g) x 1 mole = 5.40 x 10-29 mole

6.02 x 1023molecules

5.40 x 10-29mole CO2 x 22.4L = 1.21 x 10-17 L CO2

1 mole