9) There are 8.0 moles of NaCl in 2 liters of a 4.0 M NaCl solution.
Calculating the moles of NaCl in a solution
The question in the image asks for the moles of NaCl in 2 liters of a 4.0 M NaCl solution. To calculate this, we can use the following formula:
Molarity = moles of solute / liters of solution
In this case, the molarity is 4.0 M and the volume of the solution is 2 liters. We need to find the moles of NaCl (solute).
Steps to solve:
Rearrange the formula to solve for moles of solute:
moles of solute = Molarity x liters of solution
Substitute the known values:
moles of NaCl = 4.0 M x 2 L
Calculate the moles of NaCl:
moles of NaCl = 8.0 moles