Primary alcohols (e.g., ethanol) can be converted to carboxylic acids by reaction with dichromate. Balance the following reaction and give the coefficient for H+ in the final correctly balanced equation.
___CH3CH2OH + ___Cr2O72- + ___H+ → __CH3COOH + __Cr3+ + __H2O
A) 16 B) 22 C) 3 D) 12 E) 18