CIS Chemistry
Ch 3 Extra Practice
1. What is the mass, in grams, of 0.0714 moles of Iron (III) sulfate?
2. You have 8.776 g of ammonium carbonate. How many moles do you have?
3. You have 35.0 grams of aspirin, C9H8O4. How many oxygen atoms do you have?
4. Adrenaline is known to contain 59.0% C, 7.1% H, 26.2% O and 7.7% N. Its molar mass
is roughly 180 g/mol. What are the Empirical and Molecular formulas for adrenaline?
5. a.) Write an equation that could be used to represent the combustion of octane, C8H18.
b.) How many moles of O2 are needed to burn 1.25 mol of octane?
c.) Calculate the mass of carbon dioxide that can be formed from 35.0 g of octane and
45.0 g of oxygen.
6. Determine the percent carbon by mass in the compound calcium carbonate.
7. How many carbon atoms are there in two moles of C3H6O?
8. Complete the following rxns and classify according to type (includes all 5 types of rxns –
synthesis, decomposition, combustion, single replacement & double replacement):
a.
_____C3H6
b.
_____Ca + ______H2SO4
c.
_____Na2O
d.
_____ K
e.
_____ AgNO3 +
f.
_____ K +
g.
+
→
_____O2
→
→
+
_____ Cl2
_____ CaCl2
_____ HOH
____ NaHCO3 +
→
→
→
____ H2SO4
→
9. The following equations contain errors. Identify the error(s) and re-write the
equations correctly.
K2O →
K2 + O
Al + Cl2
→
AlCl2
AgNO3 + MgI2 → MgNO3 + AgI2
HNO3 + Ca(OH)2 → CaNO3 + H(OH)2