1 answer

A fuel cell car runs on hydrogen produced from steam-methane reforming reaction. The efficiency of the...

Question:

A fuel cell car runs on hydrogen produced from steam-methane reforming reaction. The efficiency of the fuel cell is 55% and a
A fuel cell car runs on hydrogen produced from steam-methane reforming reaction. The efficiency of the fuel cell is 55% and at voltage is 0.75 V. What is the total direct or indirect CO2 production for a trip that consumes 4 kg of hydrogen? O 8kg O 0.4 kg o 22 kg 108 kg

Answers

In fuel cell the reactio takes place as follows

anode reaction CH4 + H2O -------> CO2 + 8H+ + 8 e-

Cathode reaction 4O2 + 8H+ + 8 e- ---------> 4H2O

Overall reaction CH4 + 2O2 -----------> CO2 + 2H2O

So, from here it is clear that 1 mole of CH4 produces 8 moles of Hydrogen

So, molar mass of H = 1 g/ mol

no. of moles of H present = given mass/ molar mass = 4000 g/1 g = 4000 moles

So, no. of moles of CH4 present = 500 moles

molar mass of CH4 = 16 g/mol

So 500 moles = 500 moles * 16 g/moles = 8000 g = 8 kg

.

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