1. (Mole-Mole problems)

2. (Mole-Mole problems) Use the coefficients to predict the amount of reactant consumed or product formed
The ratio of the coefficients is a ratio of the moles taking part in a reaction.
Reactants (on the left of the arrow) are consumed
Products (on the right of the arrow) are formed
Given the number of moles of any substance in a reaction, you can use the coefficients to find the number of moles of any other substance.
J Deutsch 2003

3. Place the moles given over the coefficient for that substance and set up a proportion with the coefficients.
How many moles of oxygen are produced when 4 moles of KClO3 react according to the equation: 2 KClO KCl + 3 O2 X
2 KClO KCl + 3 O2
4 = X
cross multiply to get 2X = 12
X=6 moles
unknown
given
J Deutsch 203

5. Regents Question: 06/03 #20 þ Given the reaction:
PbCl2 (aq) + Na2CrO4 (aq) PbCrO4 (s) + 2NaCl(aq)
What is the total number of moles of NaCl formed when 2 moles of Na2CrO4 react completely?
(1) 1 mole
(2) 2 moles
(3) 3 moles
(4) 4 moles þ
J Deutsch 2003

6. Regents Question: 06/03 #20 þ Given the reaction:
PbCl2 (aq) + Na2CrO4 (aq) PbCrO4 (s) + 2NaCl(aq)
What is the total number of moles of NaCl formed when 2 moles of Na2CrO4 react completely?
(1) 1 mole
(2) 2 moles
(3) 3 moles
(4) 4 moles þ
J Deutsch 2003

7. Regents Question: 06/02 #34
A compound has a gram formula mass of 56 grams per mole. What is the molecular formula for this compound?
CH2
C2H4
C3H6
C4H8 þ
J Deutsch 2003

8. Regents Question: 01/03 #42 þ Given the equation:
2C2H2(g) + 5O2(g) CO2(g) + 2H2O(g)
How many moles of oxygen are required to react completely with 1.0 mole of C2H2?
2.5
2.0
5.0 10 þ
J Deutsch 2003