2HCl + Mg = H2 + MgCl2
We are given 0.10 grams of Mg
The concentration of Mg = 24g/mol
Using avogadro's law
(V=n/c; v-volume(L),
n-number of moles(mol), c-concentration(g/L))
we have to predict the amount of HCl needed. help !
However, you CAN calculate the g HCl/mol given these data which is a concentration unit (in the same sense that 24 g/mol Mg is a concn unit) although I usually don't think of it that way.
To predict the amount of HCl needed, we need to determine the number of moles of magnesium (Mg) in the given 0.10 grams of Mg.
First, we need to calculate the number of moles of Mg using its molar mass, which is 24 g/mol:
Number of moles of Mg = Mass of Mg / Molar mass of Mg
= 0.10 g / 24 g/mol
Now we have the number of moles of Mg. According to the balanced chemical equation, the stoichiometric ratio between Mg and HCl is 1:2. This means that for every 1 mole of Mg, we need 2 moles of HCl.
So, to predict the amount of HCl needed, we multiply the number of moles of Mg by the stoichiometric ratio:
Number of moles of HCl = Number of moles of Mg × (2 moles of HCl / 1 mole of Mg)
= (0.10 g / 24 g/mol) × (2 moles of HCl / 1 mole of Mg)
Now, using Avogadro's law, we can calculate the volume of HCl needed.
V = n / c
Here, V is the volume of HCl, n is the number of moles of HCl, and c is the concentration of HCl.
Assuming we are given the concentration of HCl, let's say it is 0.1 g/L (you can use the actual concentration value if given).
Volume of HCl = Number of moles of HCl / Concentration of HCl
= (0.10 g / 24 g/mol) × (2 moles of HCl / 1 mole of Mg) / 0.1 g/L
By substituting the given values, you can calculate the volume of HCl needed in liters.
Convert 0.10 g Mg to mols.
Convert mols Mg to mols HCl.
Convert mols HCl to grams HCl.
This will give you grams HCl, however, not volume. The volume HCl can't be calculated unless there is some concentration of HCl given (at least if I read the problem correctly).
how do i convert mols of Mg to HCl, if the grams of HCl aren't given?
p.s we're supposed to use the equation V=n/c (avogadro's law)
You use the coefficients in the balanced chemical equation.
mols Mg x (2 mols HCl/1 mol Mg) = mols HCl.
Then to convert to grams, mols x molar mass.
(Avogadro's Law talks about equal volume of gases containing equal numbers of particles but there is nothing in yuor equation that leads me to believe we have gases present--except, of course for hydrogen).