1. #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

2. #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. 3) How many moles is 2.80 x 1023 atoms of silicon?
4.65 mol Si

4. representative particles of bromine?
4) How many moles is 2.17 x 1023
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

5. 5) How many atoms are in 1.14 mol SO3
1 molecule
1.14 mole 1
6.02 molecules
1 mole X X
2.75 x atoms

6. 6) How many moles are in 4.65 x 1024 molecules of NO2 SO3 1 mole

7. To find the molar mass simply add up the atomic masses of the atoms
#7 Find the molar mass of PCl3
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
= g

8. #8 What is the mass of 1.00 mol of 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
= 84.0 g

9. #9 What are three ways to measure the
amount of something?
simple counting
volume
weight

10. #10 Describe the relationship between
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

11. #11 How is the atomic mass of an element
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 x 1023
particles.

12. #12 How can you calculate the mass of a
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

13. #13 How many moles is 1.50 X 1023
molecules NH3?
1 mole NH3
6.02 x 1023 molecules
1.50 X 1023 molecules NH3 1 X
2.49 x 10-1 mole NH3

14. #14 How many atoms are in 1.75 moles
of CHCl3?
6.02 x 1023 atoms
1 mole
1.75 moles of CHCl3 1 X
5.27 x 1024 atoms

15. #15 What is the molar mass of CaSO4?
= g/mol