Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL.
The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of Hydrogen Peroxide solution (1.054 g/mL) to convert g soln to mL soln.
15% w/w = 15 g H2O2/100 g solution.
mass = volume x density. You know mass and density, solve for volume in mL and convert to L.
mols H2O2 = grams/molar mass, then
M = mols/L solution.
idk lol
Why did the chemist feel awkward at the party?
Because all the other guests were talking about molarity, but all he wanted to do was convert grams to milliliters!
But hey, let's get back to business. We know that 15.0% by mass of Hydrogen Peroxide solution means that there are 15.0 grams of Hydrogen Peroxide in a 100.0 gram solution.
So now, let's convert the grams of the solution to milliliters. Since we know the density of the Hydrogen Peroxide solution is 1.054 g/mL, we can use this conversion factor:
100.0 g x (1 mL / 1.054 g) = approximately 94.83 mL
Now that we have the volume of the solution, we can determine the molarity of the Hydrogen Peroxide. Molarity is defined as moles of solute per liter of solution.
To find the moles of Hydrogen Peroxide, we need to know its molar mass, which is 34.0147 g/mol.
So, the moles of Hydrogen Peroxide in 15.0 grams can be calculated as:
moles = grams / molar mass
moles = 15.0 g / 34.0147 g/mol ≈ 0.4417 mol
Finally, let's calculate the molarity:
Molarity = moles / volume
Molarity = 0.4417 mol / 0.09483 L ≈ 4.652 M
So, the molarity of the 15.0% by mass Hydrogen Peroxide solution is approximately 4.652 M. But remember, always keep a "mole" sense of humor!
To determine the molarity of the Hydrogen Peroxide solution, we first need to convert the grams of solution to milliliters of solution using the density of the solution.
Given:
Mass of Hydrogen Peroxide = 15.0 g
Density of Hydrogen Peroxide solution = 1.054 g/mL
To convert grams of solution to milliliters of solution, we will use the formula:
Volume (mL) = Mass (g) / Density (g/mL)
First, let's calculate the volume of the solution:
Volume (mL) = 100.0 g / 1.054 g/mL
Volume (mL) = 94.83 mL
Now that we have the volume of the solution, we can proceed to calculate the molarity.
Molarity (M) is defined as the number of moles of solute per liter of solution. Since we have the mass of the solute (Hydrogen Peroxide) and the volume of the solution, we can use the molecular weight of Hydrogen Peroxide to find the number of moles.
The molecular weight of Hydrogen Peroxide (H2O2) is 34.0147 g/mol.
First, we need to convert the mass of Hydrogen Peroxide to moles using the formula:
Moles = Mass (g) / Molecular weight (g/mol)
Moles = 15.0 g / 34.0147 g/mol
Moles = 0.4414 mol
Next, we need to convert the volume of the solution from milliliters to liters:
Volume (L) = 94.83 mL / 1000 mL/L
Volume (L) = 0.09483 L
Finally, we can calculate the molarity using the formula:
Molarity (M) = Moles / Volume (L)
Molarity (M) = 0.4414 mol / 0.09483 L
Molarity (M) = 4.646 M
Therefore, the molarity of the 15.0% by mass Hydrogen Peroxide solution is 4.646 M.