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 find the number of moles of ethanol, we can use the equation:
moles = concentration (M) x volume (L)
First, we need to convert the volume from milliliters (ml) to liters (L). Since there are 1000 ml in 1 L, we have:
volume (L) = 250.0 ml / 1000 ml/L
= 0.250 L
Next, we can substitute the given values into the equation:
moles = 1.90 M x 0.250 L
= 0.475 moles
So, there are 0.475 moles of ethanol in 250.0 ml of a 1.90M ethanol solution.
Therefore, the answer is D. 0.475