Problem: A mixture of 0.0375 g of hydrogen and 0.0185 mol of oxygen in a closed container is sparked to initiate a reaction.How many grams of water can form? Which reactant is in excess, and how many grams of it remain after the reaction?

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We’re being asked a) How many grams of water can form, b) which reactant is in excess, and c) how many grams of excess reactant remain after the reaction


For this problem, we need to do the following steps:

Step 1: Write and balance a chemical equation for the given reaction.

Step 2: Determine the limiting reactant and calculate the moles of H2O formed.

Step 3: Calculate the mass of excess reactant required for the reaction.

Step 4: Calculate the amount of excess remaining.


Step 1: From the problem, the given  reaction is:

 2 H2 + O2 →  2 H2O


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Problem Details

A mixture of 0.0375 g of hydrogen and 0.0185 mol of oxygen in a closed container is sparked to initiate a reaction.

How many grams of water can form? Which reactant is in excess, and how many grams of it remain after the reaction?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. You can view video lessons to learn Limiting Reagent. Or if you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Randles' class at UCF.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.