WorksheetsStoichiometry Basics Review
Total questions: 14
Worksheet time: 13mins
Why must chemical equations be balanced?
So that the equation doesn't explode
The reaction won't happen until it is balanced
Based on the Law of Conservation of Matter, matter cannot be created or destroyed.
Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
Mg and O2
MgO
Mg and MgO
O2 and MgO
Use the following BALANCED chemical equation: 4NH3+6NO → 5N2+6H2O What is the ratio of NH3 to N2
4:5
1:1
2:3
5:6
SHOW WORK ON YOUR PAPER:
Equation is balanced.
N2 + 3H2 --> 2NH3 How many moles of N2 is needed to react with 6 moles of H2?
6.7
2.0
3.0
15.0
To remember steps, no matter what.....what always goes in the upper left and bottom right of our conversion factors
1 gram
1 mole
the coefficient
the name
Converting from grams C2H18 to grams CO2 , the first conversion factor has grams of what on the bottom
C2H18
CO2
O2
H2O
The middle conversion factor is the
mole ratio of C2H18 to CO2
molar mass of CO2
molar mass of O2
combination lock of your locker
WHAT IS WRONG WITH THIS SET UP??? (other than the missing info)
Your mom
There should be 2 moles per gram.
molar ratio is switched
nothing wrong
SHOW YOUR WORK ON PAPER!
SO2 + PCl5 --> SOCl2 + POCl3
How many grams PCl5 are required to complete this reaction when given 16.2g SO2?
Given Molar masses! SO2 = 64.07 g/mol; PCl5 = 208.22 g/mol
52.6 g
30.1g
26.4g
19.8g
SHOW YOUR WORK ON PAPER!
3CaCO3 + 2FePO4 --> Ca3(PO4)2 + Fe2(CO3)3
We start with 100. g of CaCO3 and 45 g of FePO4, How many grams of calcium phosphate are produced?
Identify the limiting reactant.
Given molar masses: (CaCO3 = 100.09 g/mol; FePO4 = 150.82 g/mol)
iron(V) phosphate
calcium carbonate
iron(III) phosphate
calcium(II) carbonate
Actual yield = 62g
Calculate the percent yield.
