Answer:
7.46 g
Step-by-step explanation:
The mass of KCl needed to prepare a solution can be calculated using the formula:
Mass = Concentration x Volume x Molecular weight
In your case, the mass of KCl needed to prepare a 4.00 L solution of 0.200 M concentration can be calculated as follows:
Mass = 0.200 M x 4.00 L x 74.55 g/mol = 7.46 g.
Therefore, you would need 7.46 g of KCl to prepare a 4.00 L solution of 0.200 M concentration.