Title: Mol-Mol Calculation Example 2
Course: Stoichiometry

Problem:

Using the reaction:

2 H_2 + O_2 ==> 2 H_2O

Determine how many mol O_2 are needed to react with 36 mol H_2.

Step 1: Write what you are given.

Step 2: Pick the correct mole ratio conversion factor.
Since "H_2" and "O_2" are both in the problem, it should contain both "H_2" and "O_2" in the conversion factor. Choose the one with "mol H_2" on the bottom to cancel out the "mol H_2" on the top.

Step 3: Cancel the units.

Step 4: Do the math.

The answer should be reported as 18 mol O_2.

There are 2 sig figs in the given (36 mol H_2), therefore the answer should also have 2 sig figs.

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