Question

How much ethanol could be oxidized by potassium dichromate?

Answer 1

Unknown, because the concentration of the potassium dichromate is unspecified.

Explanation:

The question is incomplete. `[K_2Cr_2O_7]` remains unspecified. Of course the molar mass of potassium dichromate is `294.19*g*mol^-1` but I think you know this already.