"Following the reaction of zinc with hydrochloric acid, a secondary reaction can occur if a product of the first reaction is ignited. Write the complete reactions for both reactions."
"If 2.75g zinc with 0.15 moles HCL, how much flammable product can be collected?"
I know one of the equations but i have no clue how to write the heated formula?
Zn(aq) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)
Second reaction is burning H2.
2H2(g) + O2(g) ==> 2H2O
Usually we show heat by place a delta sign over the arrow. That can't be done on these boards; an alternative way is
2H2 + O2 + heat==> 2H2O
To write the complete reactions for both reactions, we need to understand the chemical properties of zinc and hydrochloric acid.
The first reaction is the reaction of zinc (Zn) with hydrochloric acid (HCl):
Zn + 2HCl → ZnCl2 + H2
In this reaction, zinc reacts with hydrochloric acid to produce zinc chloride (ZnCl2) and hydrogen gas (H2).
Now, let's move on to the secondary reaction. Based on the given information that a product of the first reaction is ignited, we can assume that the product being referred to is hydrogen gas (H2). When hydrogen gas is ignited, it undergoes combustion, combining with oxygen in the air to form water (H2O), as follows:
2H2 + O2 → 2H2O
Therefore, the complete reaction for the secondary reaction (ignition of hydrogen gas) is:
2H2 + O2 → 2H2O
Now, let's move on to the second part of your question.
To determine how much flammable product (hydrogen gas) can be collected, we need to first determine the limiting reactant in the first reaction. The limiting reactant is the reactant that is completely consumed and determines the maximum amount of product that can be formed.
Given:
Mass of zinc (Zn) = 2.75 g
Number of moles of hydrochloric acid (HCl) = 0.15 mol
Let's calculate the number of moles of zinc (Zn) using its molar mass:
Molar mass of zinc (Zn) = 65.38 g/mol
Number of moles of zinc (Zn) = Mass of zinc (Zn) / Molar mass of zinc (Zn) = 2.75 g / 65.38 g/mol
Now, we need to compare the moles of zinc (Zn) with moles of hydrochloric acid (HCl) to determine the limiting reactant. From the balanced chemical equation, we can see that the stoichiometric ratio between zinc (Zn) and hydrochloric acid (HCl) is 1:2. Therefore, we need to double the number of moles of zinc (Zn) to compare with the number of moles of hydrochloric acid (HCl).
Number of moles of zinc (Zn) = (2.75 g / 65.38 g/mol) * 2
Now, compare the number of moles of zinc (Zn) and hydrochloric acid (HCl) to determine the limiting reactant. The reactant that has the smaller number of moles is the limiting reactant.
If the number of moles of zinc (Zn) is smaller, then zinc (Zn) is the limiting reactant. If the number of moles of hydrochloric acid (HCl) is smaller, then hydrochloric acid (HCl) is the limiting reactant.
Once we determine the limiting reactant, we can calculate the maximum amount of hydrogen gas (H2) that can be produced.
To determine the maximum number of moles of hydrogen gas (H2), we look at the stoichiometric ratio between hydrogen gas (H2) and zinc (Zn) in the balanced chemical equation, which is 1:1.
If zinc (Zn) is the limiting reactant, the maximum number of moles of hydrogen gas (H2) will be equal to the number of moles of zinc (Zn).
If hydrochloric acid (HCl) is the limiting reactant, we need to use the stoichiometric ratio between hydrogen gas (H2) and hydrochloric acid (HCl), which is 1:1. Therefore, the maximum number of moles of hydrogen gas (H2) will be equal to the number of moles of hydrochloric acid (HCl).
Once we determine the maximum number of moles of hydrogen gas (H2), we can calculate the mass of hydrogen gas (H2) produced using its molar mass, which is 2.02 g/mol.
To summarize, follow these steps to calculate the amount of flammable product (hydrogen gas) that can be collected:
1. Calculate the number of moles of zinc (Zn) using its molar mass.
2. Double the number of moles of zinc (Zn) to compare with the number of moles of hydrochloric acid (HCl).
3. Compare the moles of zinc (Zn) and hydrochloric acid (HCl) to determine the limiting reactant.
4. If zinc (Zn) is the limiting reactant, the maximum number of moles of hydrogen gas (H2) will be equal to the number of moles of zinc (Zn). If hydrochloric acid (HCl) is the limiting reactant, the maximum number of moles of hydrogen gas (H2) will be equal to the number of moles of hydrochloric acid (HCl).
5. Calculate the mass of hydrogen gas (H2) produced using its molar mass.
6. The calculated mass of hydrogen gas (H2) is the answer to how much flammable product can be collected.