MoleMole problems MoleMole problems Use the coefficients to
(Mole-Mole problems)
(Mole-Mole problems) Use the coefficients to predict the amount of reactant consumed or product formed J Deutsch 2003 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. 2
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 KCl. O 3 react according to the equation: 2 KCl. O 3 2 KCl + 3 O 2 unknown 4 X given 2 KCl. O 3 2 KCl + 3 O 2 4 = X 2 3 cross multiply to get 2 X = 12 X=6 moles J Deutsch 203 3
Regents Question: 06/03 #20 Given the reaction: Pb. Cl 2 (aq) + Na 2 Cr. O 4 (aq) Pb. Cr. O 4 (s) + 2 Na. Cl(aq) What is the total number of moles of Na. Cl formed when 2 moles of Na 2 Cr. O 4 react completely? (1) 1 mole (2) 2 moles (3) 3 moles (4) 4 moles J Deutsch 2003 5
Regents Question: 06/03 #20 Given the reaction: Pb. Cl 2 (aq) + Na 2 Cr. O 4 (aq) Pb. Cr. O 4 (s) + 2 Na. Cl(aq) What is the total number of moles of Na. Cl formed when 2 moles of Na 2 Cr. O 4 react completely? (1) 1 mole (2) 2 moles (3) 3 moles (4) 4 moles J Deutsch 2003 6
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? (1) CH 2 (2) C 2 H 4 (3) C 3 H 6 (4) C 4 H 8 J Deutsch 2003 7
Regents Question: 01/03 #42 Given the equation: 2 C 2 H 2(g) + 5 O 2(g) 4 CO 2(g) + 2 H 2 O(g) How many moles of oxygen are required to react completely with 1. 0 mole of C 2 H 2? (1) 2. 5 (2) 2. 0 (3) 5. 0 (4) 10 J Deutsch 2003 8
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