Taking into account the reaction stoichiometry, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
<h3>Reaction stoichiometry</h3>
In first place, the balanced reaction is:
2 H₂+ O₂ → 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
- H₂: 2 moles
- O₂: 1 mole
- H₂O: 2 moles
The molar mass of the compounds is:
- H₂: 2 g/mole
- O₂: 32 g/mole
- H₂O: 18 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
- H₂: 2 mole× 2 g/mole= 4 grams
- O₂: 1 mole× 32 g/mole= 32 grams
- H₂O: 2 moles× 18 g/mole= 36 grams
<h3>Mass of H₂O formed</h3>
You can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.
<h3>Summary</h3>
In summary, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
Learn more about the reaction stoichiometry:
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