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# #1) If 0.20 bushel is 1 dozen apples and a dozen apples has a mass of 2.0 kg, what is the mass - PowerPoint PPT Presentation

#1) If 0.20 bushel is 1 dozen apples and a dozen apples has a mass of 2.0 kg, what is the mass of 0.50 bushel of apples?. ____2.0 Kg___ 1 dozen apples. .20 bushel 1 dozen apples. 2.0 Kg 1 dozen apples. 1 dozen apples .2 bushel. 0.5 bushel l. X. X. =. 5.0 Kg.

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apples has a mass of 2.0 kg, what is the mass

of 0.50 bushel of apples?

____2.0 Kg___

1 dozen apples

.20 bushel

1 dozen apples

2.0 Kg

1 dozen apples

1 dozen apples

.2 bushel

0.5 bushel

l

X

X

=

5.0 Kg

#2 Assume 2.0 kg of apples is 1 dozen and

that each apple has 8 seeds. How many

apple seeds are in 14 kg of apples?

8 seeds

1 apple

1 dozen apples

2.0 kg

12 apples

1 dozen

1 dozen

2.0 kg

14 kg apple

1

X

X

8 seeds

1 apple

672 seeds

X

=

3) How many moles is 2.80 x 1023 atoms

of silicon?

1 mole

6.02 x 1023atoms

2.80 x 1023atoms

1

X

4.65 mol Si

representative particles of bromine?

the representative particle for bromine is

Br2

1 mole

6.02 x 1024 part.

2.17 x 1023 part.

1

X

.360 mol Br2

SO3

4 atoms

1 molecule

1.14 mole

1

6.02 molecules

1 mole

X

X

2.75 x 1024 atoms

molecules of NO2

SO3

1 mole

6.02 x 1024molecules

4.65 x 1024molecules of NO2

1

X

7.72 moles

To find the molar mass simply add

up the atomic masses of the atoms

in the molecule (4 atoms total here)

P =30.97amu

Cl=35.4amu

30.97 + 35.4 + 35.4 + 35.4 = 106.5 g

sodium hydrogen carbonate?

NaHCO3 consists of 6 atoms total in

one formula unit. Adding them up you

get:

Na = 23.0g/mol H = 1g/mol

C = 12.0g/mol O= 16g/mol

23.0 + 1 + 12.0 + 16 + 16 + 16 = 84.0 g

amount of something?

simple counting

volume

weight

Avogadro’s number and one mole of any

substance.

Avogadro’s number is the number of

representative particles you have in one

mole which is 6.02 x 1023

related to the molar mass of the element?

The atomic mass is the number of grams

of an element that you need to have exactly

one mole of that substance ie. 6.02 x 1023

particles.

mole of a compound?

You add up the individual atomic masses

of each atom within the formula of

the compound.

example: H2O is 1g+1g+16g = 18 grams

1 mole

molecules NH3?

1 mole NH3

6.02 x 1023molecules

1.50 X 1023 molecules NH3

1

X

2.49 x 10-1 mole NH3

of CHCl3?

6.02 x 1023 atoms

1 mole

1.75 moles of CHCl3

1

X

5.27 x 1024 atoms

Ca =40.08 S = 32.0 O = 16

40.08 + 32.0 + 16 + 16 + 16 = 136.2 g/mol