Calculate the mass of HCl required to prepare 2.5 liters of a 0.08 molar solution of HCl.
How many mols do you want? That's mols HCl = M x L = ?
Then mols HCl = grams/molar mass. You nolw mols and molar mass, solve for mols.
To calculate the mass of HCl required to prepare a given solution, we need to use the molarity and volume of the solution.
The formula for calculating the mass of a substance is:
mass = molar mass × moles
In this case, we'll use the formula to calculate the moles of HCl required, and then convert it to mass using the molar mass of HCl.
1. Start by calculating the moles of HCl required:
moles = molarity × volume
Given:
Molarity (M) = 0.08 mol/L
Volume (V) = 2.5 L
moles of HCl = 0.08 mol/L × 2.5 L
moles of HCl = 0.2 moles
2. Next, to calculate the mass of HCl, we'll use its molar mass. The molar mass of HCl is the sum of the atomic masses of hydrogen (H) and chlorine (Cl):
Molar mass of HCl = 1.007 g/mol (for hydrogen) + 35.453 g/mol (for chlorine)
Molar mass of HCl = 36.46 g/mol
mass of HCl = moles of HCl × molar mass of HCl
mass of HCl = 0.2 moles × 36.46 g/mol
mass of HCl = 7.292 g
Therefore, the mass of HCl required to prepare 2.5 liters of a 0.08 molar solution of HCl is approximately 7.292 grams.