How many grams of H2O are produced when 2.5 moles of O2 are used?

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    Grams Moles produced
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Discussion Overview

The discussion revolves around a stoichiometry problem involving the production of water (H2O) from oxygen (O2) in a chemical reaction. Participants explore how to determine the mass of water produced when a specific amount of oxygen is used, focusing on the stoichiometric relationships in the balanced chemical equation.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant expresses confusion about how to approach the stoichiometry problem and acknowledges understanding only that the chemical equation balances.
  • Another participant provides a link to a video, suggesting it may help with understanding stoichiometry.
  • A different participant states that limiting reagents are not relevant to this specific question.
  • One participant explains that the stoichiometric proportions indicate that 2.5 moles of O2 will produce 5 moles of H2O, and suggests using the formula for calculating mass from moles.
  • A hint is given about starting stoichiometry problems by calculating the number of moles of the reacting agent before converting to the product.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best approach to the problem. There are differing views on the relevance of limiting reagents and the clarity of the initial participant's understanding.

Contextual Notes

Some assumptions about the understanding of stoichiometry and the application of the balanced equation may be missing. The discussion does not resolve the initial participant's confusion or provide a definitive solution to the problem.

magaly79
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Hi I need help with a Stoichiometry problem. I am complete lost.

I don't know where to start, or how to to solve.

2H2 + O2 -2H2O. I know the formula balances and that is it.

The questions is How many grams of H2O are produced when 2.5 moles of O2 are used?

Thanks!
 
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Well you know how many moles of 02 you have.
So in order to figure out how many moles of water this will make, you need to use the stoichiometric proportions.
The equation tells you that for every one mole of O2 you will get 2 moles of H20
so multiply 2.5 moles 02 by 2.
now, knowing you have 5 moles of H2O, calculate its mass by using the equation
moles= mass/molar mass

A hint to starting stoich problems is to always calculate your number of moles of the reacting agent, and then convert it into the number of moles of the product. From there you can answer almost any question.
Good Luck!
 

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