In a chemical interaction 10 g of hydrogen chloride is added to 20 g of zinc to form 24 g of zinc chloride and a certain amount of hydrogen gas. What mass of hydrogen gas is expected to be formed?
6 g
14 g
34 g
54 g
To answer this question, 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 in a chemical reaction.
Given:
- Mass of hydrogen chloride (HCl) = 10 g
- Mass of zinc (Zn) = 20 g
- Mass of zinc chloride (ZnCl2) formed = 24 g
We need to calculate the mass of hydrogen gas (H2) formed.
To do this, we can subtract the total mass of the reactants (HCl and Zn) from the total mass of the products (ZnCl2 + H2).
Total mass of reactants = Mass of HCl + Mass of Zn = 10 g + 20 g = 30 g
Total mass of products = Mass of ZnCl2 + Mass of H2 = 24 g + Mass of H2
Now, we can use the law of conservation of mass to set up an equation:
Total mass of reactants = Total mass of products
30 g = 24 g + Mass of H2
Mass of H2 = 30 g - 24 g
Mass of H2 = 6 g
Therefore, the mass of hydrogen gas expected to be formed is 6 g.
To determine the mass of hydrogen gas that is expected to be formed in this chemical reaction, we need to calculate the difference in mass before and after the reaction.
First, let's find the mass of hydrogen chloride (HCl) reacted. We know that 10 g of hydrogen chloride was added to the reaction.
Next, let's find the mass of zinc chloride (ZnCl2) formed. We know that the total mass after the reaction is 24 g. Since the only other product is zinc chloride, all 24 g can be attributed to the formation of ZnCl2.
Finally, let's find the difference in mass of hydrogen gas (H2) before and after the reaction. We begin with the total mass before the reaction, which is the sum of the mass of hydrogen chloride (10 g) and the mass of zinc (20 g).
Total mass before the reaction = 10 g (HCl) + 20 g (Zn) = 30 g
The total mass after the reaction is the sum of the mass of zinc chloride (24 g) and the mass of hydrogen gas (which we are trying to find).
Total mass after the reaction = 24 g (ZnCl2) + Mass of H2
Based on the law of mass conservation, the total mass before the reaction should be equal to the total mass after the reaction. Therefore:
Total mass before the reaction = Total mass after the reaction
30 g = 24 g (ZnCl2) + Mass of H2
To find the mass of hydrogen gas (H2), we subtract the mass of zinc chloride (ZnCl2) from the total mass before the reaction:
Mass of H2 = Total mass before the reaction - Mass of ZnCl2
Mass of H2 = 30 g - 24 g
Mass of H2 = 6 g
Therefore, the mass of hydrogen gas expected to be formed in this chemical reaction is 6 g.
To determine the mass of hydrogen gas that is expected to be formed, we need to calculate the amount of hydrogen gas that can be produced based on the balanced chemical equation.
The balanced equation for the reaction between hydrogen chloride (HCl) and zinc (Zn) is:
Zn + 2HCl -> ZnCl2 + H2
From the equation, we can see that 1 mole of zinc reacts with 2 moles of hydrogen chloride to produce 1 mole of zinc chloride and 1 mole of hydrogen gas.
To find the amount of hydrogen gas produced, we'll follow these steps:
Step 1: Calculate the moles of HCl and Zn.
Molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol
Molar mass of Zn = 65.4 g/mol
Moles of HCl = mass / molar mass = 10 g / 36.5 g/mol = 0.27 mol
Moles of Zn = mass / molar mass = 20 g / 65.4 g/mol = 0.31 mol
Step 2: Determine the limiting reactant.
The limiting reactant is the one that is completely consumed and determines the maximum amount of product that can be formed.
From the balanced equation, we can see that 1 mole of Zn reacts with 2 moles of HCl. Since we have 0.27 moles of HCl and 0.31 moles of Zn, the hydrogen chloride is limiting.
Step 3: Calculate the moles of hydrogen gas produced.
From the balanced equation, we know that 2 moles of HCl produce 1 mole of H2.
Moles of H2 = 0.27 mol HCl * (1 mol H2 / 2 mol HCl) = 0.135 mol H2
Step 4: Calculate the mass of hydrogen gas produced.
Molar mass of H2 = 2 g/mol
Mass of H2 = moles of H2 * molar mass of H2 = 0.135 mol * 2 g/mol = 0.27 g
Therefore, the expected mass of hydrogen gas that is formed is 0.27 g.