Honors Chemistry Unit IV The Mole – Test Review
Name______________________
Silver Oxide Lab–Review of calculations Balanced equation: 2 Ag2O(s)  4Ag(s) + O2(g)
Directions: Fill in the below chart; show all work; circle answers. Then complete the second trail of data on the back
without referring to the front
Lab Data
Mass of crucible (g)
Mass of crucible and
silver oxide (g)
Mass of crucible and
silver metal (g)
(after heating)
Lab Calculations
Mass of silver oxide
(g)
calculate from above lab
data
Mass of silver metal
(g)
calculate from above lab
data
This is our experimental yield
of Ag
Trial #1
16.795
17.317
Mol O in silver oxide
Convert grams of O to moles
O
17.283
Mole Ratio Ag:O
Calculate mol ratios by
dividing both the mol of Ag
and mol of O by the smaller
mol – note one of the ratios
will equal 1. If the ratio is
not close to a whole number
multiply each ratio by the
same factor to get a whole
number
EF AgxOy
If one of the ratios from the
previous calculations is not
close to a whole number
multiply each ratio by the
same factor to get a ratio
close to a whole number
Mass of oxygen (g)
calculate from above lab
data
% Composition Ag
calculate from above data
(Grams of Ag/grams of
Ag2O)x100
% Composition O
calculate from above data
(Grams of O/grams of
Ag2O)x100
Mol Ag in silver
oxide
Convert grams of Ag to
moles Ag
Theoretical yield of
silver This is the amount of
silver we mathematically (in
a perfect situation) should be
able to produce
Convert initial grams of silver
oxide to grams of silver using
molar masses and the mol to
mol relationship of Ag2O and
Ag
% yield
Experimental yield Ag x 100
Theoretical yield Ag
% error
Theor. yield Ag– Exp. Yield Ag
x100
Theoretical yield Ag
Honors Chemistry
Silver Oxide Lab–Review of calculations Name______________________
Balanced equation: 2 Ag2O(s)  4Ag(s) + O2(g)
Directions: Fill in the below chart; show all work; circle answers
Lab Data
Mass of crucible (g)
Mass of crucible and
silver oxide (g)
Mass of crucible and
silver metal (g)
Trial #2
17.962
18.469
Mol O in silver oxide
18.430
Mole Ratio Ag:O
(after heating)
Lab Calculations
Mass of silver oxide
(g)
Mass of silver metal
(g)
Mass of oxygen (g)
Empirical formula
AgxOy
Theoretical yield of
silver
% Composition Ag
% yield Ag
% Composition O
% error
Mol Ag in silver
oxide
Honors Chemistry Mole Test Review
1) How many moles are in 22.00 grams of copper?
2) How many moles are there in 31.3 grams of sodium phosphide?
3) If you have 1.10 grams of calcium phosphate, how many moles do you have of calcium phosphate?
4) How many grams are in 2.4 moles of sulfur?
5) How many grams are in 34.0 moles of sodium phosphide?
6) How much does 4.2 moles of magnesium nitrate weigh?
7) How many atoms are in 5.000 grams of silver?
8) How many Formula units are there in 24.000 grams of sodium phosphide?
9) How many molecules are in 23 moles of oxygen?
10) How many molecules are in 25.1 grams of NH3?
11) How many atoms are in 8.20 x 1022 molecules of N2I6?
13) How many atoms are in 2.0 grams of silver nitrate?
14) How many H atoms are in 4.21 mol of C12H22O11?
15) How many atoms of Fe are found in 7.18 mole of Fe2O3?
16) How many moles of H2O are there if you have 7.78 x 1025 molecules of H2O?
17) How many formula units are there in 2.4 moles of FeF3?
18) How many formula units are there in 450 grams of Na2SO4?
19) How many grams are there in 7.4 x 1023 formula units of AgNO3?
20) How many grams are there in 7.5 x 1023 molecules of H2SO4?