Calculating With Chemical Equations
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1
2
3
4Name
Period
Date
Pre-AP Chemistry
Homework: Calculating with Chemical Equations
[A] Stoichiometry Problems
1. ______________ Calculate the mass of magnesium oxide formed when 0.52 g of magnesium is burned according to the
following equation:
2 Mg
+ O
→ 2 MgO
(s)
2(g)
(s)
2. ______________ Calculate the mass of hydrogen gas that will be released when 3.0 g of sodium reacts with water.
2 Na
+ 2 H
O
→ 2 NaOH
+ H
(s)
2
(l)
(aq)
2(g)
3. ______________ What mass of silver will be precipitated when 7.32g of zinc reacts completely with silver nitrate?
Zn
+ 2 AgNO
→ Zn(NO
)
+ 2 Ag
(s)
3(aq)
3
2(aq)
(s)
4. ______________ Potassium metal reacts with hydrochloric acid to produce aqueous potassium chloride and hydrogen gas.
How many grams of potassium are required to produce 5.00 g of hydrogen gas?
5. ______________ Ethanol burns according to the following equation. If 655 g of water is produced, what mass of ethanol is
burned?
C
H
OH
+ 3O
→ 2CO
+ 3H
O
2
5
(aq)
2(g)
2(g)
2
(g)
6. ______________ How many grams of potassium chlorate, KClO
, must be decomposed to produce oxygen and 71.8 g of
3
potassium chloride?
[B] Limiting Reactant Problems
1. Calcium hydroxide, used to neutralize acid spills, reacts with hydrochloric acid according to the following equation:
+ 2HCl àCaCl
Ca(OH)
+ 2H
O
2
2
2
a. ______________ If you have spilled 6.3 mol of HCl and put 2.8 mol of Ca(OH)
on it, which substance is the limiting
2
reactant?
b. ______________ How many moles of the excess reactant remain?
Homework: Calculating with Chemical Equations
1
1/12/15
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