In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2).
Zn + 2HCl → ZnCl2 + H2
Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?
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To determine how many grams of hydrogen gas will form, we need to calculate the grams of hydrogen gas produced based on the given equation and the Law of Conservation of Mass.
Step 1: Calculate the molar masses of each element involved in the reaction.
- The molar mass of Zn (Zinc) is 65.38 g/mol.
- The molar mass of H (Hydrogen) is 1.01 g/mol.
- The molar mass of Cl (Chlorine) is 35.45 g/mol.
Step 2: Determine the moles of the elements involved in the reaction.
- Moles of Zn = mass of Zn / molar mass of Zn = 11 g / 65.38 g/mol ≈ 0.168 mol.
- Moles of HCl = mass of HCl / molar mass of HCl = 12 g / (1.01 g/mol + 35.45 g/mol) ≈ 0.285 mol.
Step 3: Use the stoichiometry of the reaction to determine the moles of H2 produced.
- Since the balanced equation shows a 1:1 ratio between HCl and H2, the moles of H2 produced will be the same as the moles of HCl consumed.
- Moles of H2 = Moles of HCl = 0.285 mol.
Step 4: Calculate the mass of H2 produced.
- Mass of H2 = Moles of H2 x molar mass of H2 = 0.285 mol x 1.01 g/mol ≈ 0.288 g.
Therefore, approximately 0.288 grams of hydrogen gas will be produced.
To determine how many grams of hydrogen gas will form in this reaction, we need to use the Law of Conservation of Mass. According to this law, the total mass of the reactants must be equal to the total mass of the products.
First, let's calculate the total mass of the reactants. We have 11 grams of Zinc (Zn) and 12 grams of Hydrogen Chloride (2HCl).
Total mass of reactants = mass of Zinc + mass of Hydrogen Chloride
= 11 grams + 12 grams
= 23 grams
Now, let's calculate the total mass of the products. We have 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2).
Total mass of products = mass of Zinc Chloride + mass of Hydrogen gas
= 16 grams + mass of Hydrogen gas
According to the Law of Conservation of Mass, the total mass of the reactants must be equal to the total mass of the products. Therefore:
Total mass of reactants = Total mass of products
23 grams = 16 grams + mass of Hydrogen gas
To find the mass of Hydrogen gas, we subtract 16 grams from both sides of the equation:
mass of Hydrogen gas = 23 grams - 16 grams
= 7 grams
Therefore, 7 grams of Hydrogen gas will form in this reaction.
convert the mass to moles.
Each mole of Zn requires 2 moles of HCl.
So, determine which reagent will run out first. That will tell you how many moles of products get formed.
Each mole of Zn used produces 1 mole of H2. Convert that back to grams.