Edexcel Jan 2016 (IAL) Paper 5 Q19

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SECTION B Answer all the questions. Write your answers in the spaces provided. 19 Methanol fuel cells have significant advantages over hydrogen fuel cells. The half equations for the methanol fuel cell are CO2 + 6H+ + 6e (cid:85) CH3OH + H2O E (cid:57) = +0.02 V E (cid:57) = +1.23 V O2 + 2H+ + 2e (cid:85) H2O (a) Use your knowledge of the hydrogen electrode to draw a labelled diagram of the half cell that could be used to measure the oxygen electrode potential. Include the conditions needed for the standard electrode potential to be measured. (3) (b) Write the overall equation for the methanol fuel cell reaction. State symbols are not required. (1) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P46941A0928* Turn over<br /> (c) Calculate the emf of this methanol cell. *(d) Suggest one advantage and one disadvantage of a methanol fuel cell compared to a hydrogen fuel cell. (1) (2)D O N O T W R I T E I N T H I S A R E A(Total for Question 19 = 7 marks) 10 *P46941A01028* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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