Chem I Worksheet #28 Stoichiometry (Mole Ratios)
Name
________________________
Text Reference
pgs 275-281
Vocabulary:
stoichiometry, mole ratio
Summary:
Chemical reactions give information about the amount of MOLES involved the
reaction. The coefficients are the
relative amounts of moles of each reactant and product used or produced in the
reaction. A mole ratio relates the
proportions of moles of any 2 reactants or products.
1) Explain why,
in the balanced chemical equation C
+ O2 à CO2 we know that 1 g of C will not react exactly with 1 g of
O2.
2) Define mole
ratio.
3) True or
False. For the reaction represented by
the balanced equation
Mg(OH)2(aq) +
2HCl(aq) à 2H2O(l) + MgCl2(aq)
if 0.40 mol of
Mg(OH)2 is to react, then 0.20 mol of HCl will be needed.
4) If number 3
above is false, how many moles of HCl
will be needed?
5) Consider the
balanced equation C3H8(g)
+ 5O2(g) à 3CO2(g)
+ 4H2O(g).
a) What is the
mole ratio that would enable you to calculate the number of moles of oxygen
needed to react exactly with a given number of moles of C3H8(g)?___________
b) What mole
ratio would enable you to calculate how many moles of carbon dioxide product would form from a given number of moles of
C3H8(g)?___________
c) What mole ratio
would enable you to calculate how many moles of water vapor product would
form from a given number of moles of C3H8(g)?___________
6) Using the following balanced equation 2Mg(s) + O2(g) à 2MgO(s)
a) How many moles of product would be produced by complete reaction of 0.15 moles of magnesium? (Be sure to show your work including the mole ratio you used)
b) How many moles of product would be produced by complete reaction of 0.15 moles of oxygen gas? (Be sure to show your work including the mole ratio you used)
7) Using the following balanced equation 4 Fe(s) + 3O2(g) à 2Fe2O3(s)
a) How many moles of product would be produced by complete reaction of 0.15 moles of iron? (Be sure to show your work including the mole ratio you used)
b) How many moles of product would be produced by complete reaction of 0.15 moles of oxygen gas? (Be sure to show your work including the mole ratio you used)
8) For each of the following unbalanced equations, calculate how many moles of the second reactant would be required to react exactly with 3.125 mol of the first reactant. Write clearly the mole ratio used for the conversion.
a) ___N2(g)
+ ___H2(g) à___NH3(g)
b) ___Al(s) +
___O2(g) à ___Al2O3(s)
9) For the
following balanced equation, NH3(g)
+ HCl(g) à NH4Cl(s)
how many moles of the product could be
produced by complete reaction of 1.00g of ammonia?