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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.
Reaction stoichiometry
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
Mass of H₂O formed
You can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.
Summary
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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