A drop of ethanol has a mass of #2.3xx10^(-3)# #"g"#. How many molecules of ethanol are in the drop?
The drop of ethanol contains
The molar mass of ethanol is
You will first need to determine the moles of ethanol present in the drop by dividing its mass by the molar mass of ethanol. Then calculate the number of molecules of ethanol by multiplying the moles ethanol times