Final answer:
To calculate the number of moles of NaCl in the solution, use the formula n = CV, where n is the number of moles, C is the molar concentration, and V is the volume of the solution in liters. Convert the volume of the solution from milliliters to liters, then substitute the values into the formula.
Step-by-step explanation:
To calculate the number of moles of NaCl in the solution, we need to use the formula:
n=CV
where n is the number of moles, C is the molar concentration, and V is the volume of the solution in liters.
First, we need to convert the volume of the solution from milliliters (mL) to liters (L):
250 mL = 0.250 L
Then, we can substitute the given values into the formula:
n = (0.55 mol/L) * (0.250 L) = 0.1375 mol
Therefore, there are 0.1375 moles of NaCl in 250 mL of a 0.55M solution.