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.
3. Matter and Energy
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
45.91 g
C
46.25 g
D
50.0 g
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction. Therefore, the total mass of reactants must equal the total mass of products.
Write the balanced chemical equation for the reaction: \( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \). This equation shows that nitrogen and hydrogen react to form ammonia.
Calculate the total mass of the products, which is given as 92.5 grams of ammonia. According to the conservation of mass, this should equal the total mass of the reactants (nitrogen and hydrogen).
Subtract the mass of hydrogen (50.0 grams) from the total mass of the products (92.5 grams) to find the mass of nitrogen that reacted. This is because the sum of the masses of nitrogen and hydrogen should equal the mass of ammonia produced.
The result from the subtraction will give you the minimum amount of nitrogen that reacted with the hydrogen to produce the given amount of ammonia.
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