Multiple Choice
Predict the amount of oxygen gas that will remain after the reaction of 112.6 grams of calcium with 24.0 grams of oxygen.
5. Classification & Balancing of Chemical Reactions
Law of Conservation of Mass
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Following the Law of Conservation of Mass, predict the minimum amount of nitrogen that will react with 50.0 grams of hydrogen to produce 92.5 grams of ammonia.
Nitrogen + Hydrogen → Ammonia
A
42.5 g
B
45.9 g
C
46.2 g
D
50.0 g
Verified step by step guidance1
Start by writing the balanced chemical equation for the reaction: N_2 + 3H_2 → 2NH_3.
Apply the Law of Conservation of Mass, which states that the mass of reactants must equal the mass of products. Here, the total mass of nitrogen and hydrogen must equal the mass of ammonia produced.
Calculate the total mass of reactants needed. Since 92.5 grams of ammonia is produced, the combined mass of nitrogen and hydrogen must also be 92.5 grams.
Subtract the mass of hydrogen from the total mass of reactants to find the mass of nitrogen. Given that 50.0 grams of hydrogen is used, subtract this from 92.5 grams.
The result from the subtraction will give you the minimum amount of nitrogen required to react with 50.0 grams of hydrogen to produce 92.5 grams of ammonia.
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