This problem came from Fuel Cell fundamentals 3rd edition

(d) If the fuel cell used methanol (CH3OH) fuel instead of H2, what would be the minimum amount (in grams) of methanol required for 100h of life again assuming 100 fuel utilization? Methanol has a molecular mass of 32 g/mol. What would be the corresponding volume of liquid methanol fuel (the density of liquid methanol is 0.79 g/cm3 )? Note that 6 electrons transfer for 1 molecule methanol consumption.