WorksheetsSCH3U Chemical Quantities Make Up Test (Tali and Sijean)
Total questions: 10
Worksheet time: 55mins
Name
Class
Date
1.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
2.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2
d)
MgN
3.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
4.
When 12 moles of O2 reacts with 6 moles of C10H8, what is the limiting reactant?
1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O
1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O
a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
5.
6Na + Fe2O3 --> 3Na2O + 2Fe
If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of excess reagent is left?
a)
232 g
b)
18 g
c)
250 g
6.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
7.
2Fe2O3 + C → Fe + 3CO2
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2? (Hint: calculate theoretical yield of CO2 first)
a)
58.83%
b)
308%
c)
6435%
d)
15.5
8.
LiOH + KCl → LiCl + KOH
I actually produced 6 grams of lithium chloride and I began this reaction with 20.0 grams of lithium hydroxide. What is my percent yield?
a)
16.9%
b)
5.91%
c)
1.88%
d)
12.3%
9.
How many molecules are in 3 moles of oxygen gas?
a)
3.612 x 10^24 molecules
b)
6.02 x 10^23 molecules
c)
1.806 x 10^24 molecules
d)
1.204 x 10^24 molecules
10.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
100 %
