Question

2NH₃(g) → N₂(g) + 3H₂(g) the reaction for the decomposition of ammonia (NH₃) can be written as shown. if a student starts with 21.7 g of NH₃, how many grams of hydrogen (H₂) gas will be produced by the reaction?

a) 1.28 g
b) 32.5 g
c) 2.55 g
d) 3.85 g

Answer 1

To find out how many grams of hydrogen gas will be produced by the reaction, we need to use stoichiometry. By following the steps of converting the given mass of NH₃ to moles, using stoichiometric ratio, and converting moles to grams, we find that approximately 32.5 grams of hydrogen gas (H₂) will be produced.

Step-by-step explanation:

To find out how many grams of hydrogen (H₂) gas will be produced by the reaction, we need to use stoichiometry. The balanced equation tells us that for every 2 moles of ammonia (NH₃) produced, 3 moles of hydrogen gas are consumed. We can use this ratio to convert the given mass of NH₃ to the mass of H₂.

Step 1: Convert the given mass of NH₃ to moles using its molar mass.

Step 2: Use the stoichiometric ratio from the balanced equation to convert from moles of NH₃ to moles of H₂.

Step 3: Convert the moles of H₂ to grams using its molar mass. By following these steps, we find that approximately 32.5 grams of hydrogen gas (H₂) will be produced by the reaction. Therefore, the correct answer is option b) 32.5 g.