Download Experiment 4-1

Stoichiometry Practice I
Honors Chemistry I
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Remember the steps to solving stoich problems:
1. Balance the equation
2. Write all given information under the compound or element
3. Write a ? and unit under compound you are trying to find
4. Set-up DA
a. Coefficients are to go from moles to moles
b. Molar mass is to go from grams to moles or moles to grams
Moles to moles
1. Use the following reaction to answer questions:
Na(s) + F2 (g)  NaF(s)
a.
b.
c.
d.
Balance the equation
How many moles of NaF would form if you start with 3.5 moles of Na?
How many moles would you need of F2, if you needed 5 moles of NaF?
How many moles of NaF would form if you start with 11 moles of F2?
2. Use the following reaction to answer questions:
Zn(s) + S8(s)  ZnS(s)
a.
b.
c.
d.
Balance the equation
How many moles of ZnS would form if you start with 2.4 moles of Zn?
How many moles would you need of S8, if you needed 4.0 moles of ZnS?
How many moles of ZnS would form if start with 6.5 moles of S8?
Moles to grams
Remember: when you need to find grams from moles, you need molar mass from periodic
table.
3. Use the following reaction to answer questions:
Ca(s) + O2 (g)  CaO(s)
a.
b.
c.
d.
Balance the equation
How many grams of CaO would form if you start with 3.5 moles of Ca?
How many grams would you need of O2, if you needed 5 moles of CaO?
How many grams of CaO would form if you start with 11 moles of O2?
4. Use the following reaction to answer questions:
Zn(s) +
a.
b.
c.
d.
AgNO3(aq)  Ag(s)
+ Zn(NO3)2(aq)
Balance the equation
How many grams of Ag would form if you start with 2.4 moles of Zn?
How many grams would you need of AgNO3, if you needed 4.0 moles of Zn(NO3)2?
How many grams of Ag would form if start with 6.5 moles of AgNO3?
Grams to moles
Remember: when you need to find grams from moles, you need molar mass from periodic
table.
5. Use the following reaction to answer questions:
Na(s) + Cl2 (g)  NaCl(s)
a.
b.
c.
d.
Balance the equation
How many moles of NaCl would form if you start with 56.3 grams of Na?
How many moles would you need of Cl2, if you needed 27.4 grams of NaCl?
How many moles of NaCl would form if you start with 11 grams of Cl2?
6. Use the following reaction to answer questions:
Mg(s) + P8(s)  Mg3P2 (s)
a.
b.
c.
d.
Balance the equation
How many moles of Mg3P2 would form if you start with 24.6 grams of Mg?
How many moles would you need of P8, if you needed 40.7 grams of Mg3P2?
How many moles of Mg3P2 would form if start with 65.0 grams of P8?
Grams to grams
Remember: when you need to find grams from moles, you need molar mass from periodic
table.
7. Use the following reaction to answer questions:
KClO3(s)  KCl(l) + O2(g)
a.
b.
c.
d.
Balance the equation
How many grams of KCl would form if you start with 56.3 grams of KClO3?
How many grams would you need of KClO3, if you formed 27.4 grams of O2?
How many grams of O2 would form if you formed 11 grams of KCl?
8. Use the following reaction to answer questions:
CH4(g) + O2(g)  CO2(g) + H2O(l)
a.
b.
c.
d.
Balance the equation
How many grams of H2O would form if you start with 24.6 grams of CH4?
How many grams would you need of O2, if you formed 40.7 grams of CO2?
How many grams of CO2 would form if start with 65.0 grams of CH4?