You need to make up 2 litres of a 4 M solution of sodium chloride. What mass of sodium chloride do you need?
(mwt of sodium chloride = 58.44)
How many mols do you need? That's mols = M x L = ?
How many grams is that?
That's g = mols x molar mass = ?
To calculate the mass of sodium chloride needed, we need to know the molar concentration of the solution and the desired volume of the solution.
In this case, we want to prepare a 4 M (molar) solution of sodium chloride with a volume of 2 liters.
To calculate the mass of sodium chloride, we will use the formula:
Mass = Volume x Concentration x Molar mass
Given that the volume is 2 liters and the concentration is 4 M, we can substitute these values into the formula:
Mass = 2 liters x 4 M x (58.44 g/mol)
Now, we can solve for the mass:
Mass = 8 x 58.44 g
Mass = 467.52 g
Therefore, you would need 467.52 grams of sodium chloride to make 2 liters of a 4 M solution.