Question

A sample of beer is 4.6% by Mass C2H5OH. The density of beer is 0.93 g/mL. What is the molar concentration of C2H5OH in this sample of beer?

Answer 1

assume a liter of beer...
Molarity=molesalcho/1

but mass alcohol=.046*.93*1000= you do it.

Molarity=massalcohol/MolmassC2H5OH

and there you have it.

Answer 2

So the answer is:
43.78 / 46.068 = 0.929 M?

Answer 3

recheck your mass alcohol...
.046*.93*1000= in your google search window