BCE

Oklahoma State University

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1. Consider the following particulate level diagrams for the reaction between hydrogen, H2, and oxygen, O2, to form water, H2O.

Consider the four diagram's (a, b, c and d)

a)

b)

c)

d)

Which diagram(s) ICE table conforms to the balanced chemical equation;

2H2(g) + O2(g) --> 2H2O(g)

Diagram(s)

Which diagram(s) ICE table do not conform to the balanced chemical equation;

2H2(g) + O2(g) --> 2H2O(g)

Diagram(s)

When doing stoichiometry problems using ICE tables one type of problem provides an amount of product (in grams) and asks for the amount of each reactant required to produce the amount of product.

2. Calculate the mass of hydrogen, H2, and oxygen, O2, required to produce/form 68.0 grams of water, H2O.

To solve this problem let's build an ICE table. We will complete the ICE table below in a series of steps.

Step 1: Complete the Final row by entering the number of moles of H2 and O2 remaining after the reaction is complete and the number of moles of H2O produced/formed.

 

2H2(g)

+ O2(g)

-->

2H2O(g)

Initial

 

Change

 

Final

Step 2: We need to think momentarily about the Initial row...we are going to calculate the mass of H2 and O2 formed but we also need to think about how much H2O is present initially. Without any other information in the problem we will assume there is no H2O present initially. In the Initial row enter the moles of H2O as "0".

Step 3: Knowing the Initial moles of H2O is "0" and the Final moles of H2O are the amount you entered in Step 1, calculate the Change in the moles of H2O and enter that in the cell for H2O.

Step 4: Knowing the Change in moles of H2O, enter the Change in moles of H2 and O2. (Remember the ratios of the moles in the Change Row for H2, O2 and H2O must correspond to the coefficients in the balanced chemical equation.

Step 5: Knowing the Final moles of H2 and O2 and Change moles of H2 and O2 calculate the Initial moles of H2 and O2.

Step 6: Finally calculate the mass of H2 and O2 required to produce 68 grams of H2O.

You should now have a complete ICE table with every cell entry occupied.

3. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

4. If there is one question you would like to have answered in lecture, what would that question be?