Question

How many moles of NH3 would be formed from the complete reaction of 16.0 g H2?

Answer 1

Taking into account the reaction stoichiometry, 5.33 moles of NH₃ are formed from the complete reaction of 16 grams of H₂.

Reaction stoichiometry

In first place, the balanced reaction is:

N₂ + 3 H₂ → 2 NH₃

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:

• N₂: 1 mole
• H₂: 3 moles
• NH₃: 2 moles

The molar mass of the compounds is:

• N₂: 14 g/mole
• H₂: 2 g/mole
• NH₃: 17 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

• N₂: 1 mole ×14 g/mole= 14 grams
• H₂: 3 moles ×2 g/mole= 6 grams
• NH₃: 2 moles ×17 g/mole=34 grams

Mass of NH₃ formed

The following rule of three can be applied: if by reaction stoichiometry 6 grams of H₂ form 2 moles of NH₃, 16 grams of H₂ form how many moles of NH₃?

$moles of NH_{3}= \frac{16 grams of H_{2} x2moles of NH_{3}}{6 grams of H_{2}}$

moles of NH₃= 5.33 moles

Then, 5.33 moles of NH₃ are formed from the complete reaction of 16 grams of H₂.

Learn more about the reaction stoichiometry:

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