How many moles of ethanol is contained in 250.0 ml of a 1.90M ethanol solution?
A. none of these
B. 7.60
C. 475
D. 0.475
To determine the number of moles of ethanol contained in a solution, we need to use the formula:
moles of ethanol = volume of solution (in liters) x concentration of ethanol (in moles per liter)
First, we need to convert the volume of the solution to liters. We are given that the volume is 250.0 ml. To convert this to liters, we divide by 1000:
volume of solution = 250.0 ml / 1000 = 0.250 liters
Next, we multiply the volume of the solution by the concentration of ethanol:
moles of ethanol = 0.250 liters x 1.90 moles/liter = 0.475 moles
Therefore, the correct answer is D. 0.475 moles of ethanol.