dr. bob 222 the chemistry KING, would you pls help 🥺
If you mix 8.1 g of HCl in enough water to
make 0.7 L (700 mL) of solution, what is the
molarity of the solution?
Answer in units of M.
Why wouldn't the same procedure for that 0.099 g CuSO4.5H2O to M work?
moles = grams/molar mass = ?
M = mols/L solution
dr. bob supremacy 🧎🏽♀️
@ emma african
That's a lot of significant figures.
The 0.7 numbers says 1 is all you can have.
To find the molarity of the solution, we need to calculate the number of moles of HCl present in the solution, and then divide it by the volume of the solution in liters.
Step 1: Calculate the number of moles of HCl.
To do this, we need to use the formula:
moles = mass / molar mass
The molar mass of HCl (hydrochloric acid) is calculated by adding the atomic masses of hydrogen (H) and chlorine (Cl). The atomic mass of hydrogen is 1.00784 g/mol, and the atomic mass of chlorine is 35.453 g/mol.
molar mass HCl = (1.00784 g/mol) + (35.453 g/mol) = 36.460 g/mol
Now we can calculate the number of moles of HCl:
moles HCl = 8.1 g / 36.460 g/mol = 0.22205 mol
Step 2: Calculate the molarity of the solution.
The molarity is defined as moles of solute divided by the volume of solution in liters:
Molarity (M) = moles of solute / volume of solution (in liters)
In this case, the volume of the solution is given as 0.7 L (700 mL).
Molarity = 0.22205 mol / 0.7 L = 0.317 M (rounded to three decimal places)
Therefore, the molarity of the solution is 0.317 M.