3. Zinc + hydrochloric acid yields zinc chloride and hydrogen gas. (Zinc has a +2 charge).
Label what type of reaction (synthesis, decomposition, single replacement, double replacement or combustion)
Write the balanced chemical equation
How much of each reactant is needed to produce 150 grams of hydrogen gas?
This is a single replacement reaction.
The balanced chemical equation is:
Zn + 2HCl -> ZnCl2 + H2
To determine how much of each reactant is needed to produce 150 grams of hydrogen gas, we need to use the stoichiometry of the reaction.
From the balanced equation, we can see that for every 1 mole of Zn, 1 mole of H2 is produced.
To find the amount of Zn needed, we need to convert grams of H2 to moles using the molar mass of H2. The molar mass of H2 is 2.02 g/mol. Therefore, 150 grams of H2 is equal to 150/2.02 = 74.26 moles of H2.
Since the reaction has a 1:1 mole ratio between Zn and H2, we need 74.26 moles of Zn.
To find the amount of hydrochloric acid (HCl) needed, we need to use the mole ratio between Zn and HCl from the balanced equation, which is 1:2. Therefore, we need twice the amount of moles of HCl compared to moles of Zn.
So, we need 74.26 x 2 = 148.52 moles of HCl.
In summary, to produce 150 grams of hydrogen gas, we need 74.26 moles of zinc and 148.52 moles of hydrochloric acid.