I've tried this problem a couple times, but can't seem to come up with the proper answer.

Question:
Consumer products express concentrations in mg/volume or g/volume because the general public isn't familiar with molarity.
a) A medium-sized (296 mL) cup of coffee contains 0.10 g caffeine, C8H10N4O2. Express this concentration in molarity.

My work:
0.10 g C8H10N4O2/296 mL X 1mol/74g X 1 mL/10-3 L

I'm not sure where to go from here. I keep getting 4.56, which the textbook says is wrong. Is anyone able to point me in the right direction?

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

what is the question?