Answers to GIA 5-6 There are no pictures here since copying and pasting these causes the Front Page sheet to shut down.
The answers are described below:
Task 1: Predicting Product amounts
(a) Draw in the correct number of product molecules that can form based on the number of reactant molecules in the reactant picture. Be sure to include in the product picture any unused excess reactant molecules. The reaction is N2(g) + 3 H2(g) à 2NH3(g)
[There should be pictures of 6 NH3 molecules and 1 N2 in the box.]
(b) What is the limiting reactant? (Answer: H2)
Task 2: Predicting reactant amounts:
(a) Draw in the correct number of reactant molecules that were present in the initial “reactant picture” to form the “product picture.” The reaction is the same as above. [There should be pictures of 8 H2 molecules and 2 N2 in the box.]
(b) What is the limiting reactant? (Answer: N2)
Task 3: Predicting Reactants and Products in other reactions
(a) Draw in the correct number of product molecules that can form based on the number of reactant molecules in the reactant picture. Be sure to include in the product picture any unused excess reactant molecules. The reaction is 2NO(g) + O2(g) à 2NO2(g) [There should be pictures of 4 NO2 molecules and 2 O2 in the box.]
(b) What is the limiting reactant? (Answer: NO)
Task 4: Practice using equations and moles:
Use the following equation to answer the questions:
C2H4(g) + 3O2(g) à 2CO2(g) + 2H2O(l)
(a) If 1.5 mol of C2H4 reacts completely with O2 how many moles of CO2 can be formed? (3.0 mol)
(b) If 5.1 mol of O2 reacts completely with C2H4 how many moles of CO2 can be formed? (3.4 mol)
(c) If 5.1 mol of O2 reacts with 1.5 mol of C2H4 what is the limiting reactant? (C2H4 is limiting.)
(d) If 5.1 mol of O2 reacts with 1.5 mol of C2H4 how many moles of H2O can be formed? (3.0 mol)
(e) In question (d) which reactant determined the amount of product that could form? Explain. (The amount of C2H4 determines how much product can form since this is the limiting reactant.)
(f) If 5.1 mol of O2 reacts with 1.5 mol of C2H4 what amount of excess reactant remains at the end of the reaction? (0.6 mol O2 remains.)
