Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is

CH_{3}OH_{\left ( l \right )}+\frac{3}{2}O_{2\left ( g \right )}\rightarrow CO_{2\left ( g \right )}+2H_{2}O_{\left ( l \right )}

At 298 K standard Gibb’s energies of formation for CH_{3}OH_{\left ( l \right )},H_{2}O_{\left ( l \right )}\: and\: CO_{2\left ( g \right )}

are –166.2, –237.2 and –394.4 kJ mol-1 respectively. If standard enthalpy of combustion of methanol is –726 kJ mol-1 , efficiency of the fuel cell will be

  • Option 1)

    80

  • Option 2)

    87

  • Option 3)

    90

  • Option 4)

    97

 

Answers (1)

best_answer

Concept missing

Efficiency of fuel cell (\eta)=\frac{\Delta G^{o}}{\Delta H^{o}}=\frac{-702.6}{1-726}\times 100=97 \ ^{o}/_{o}


Option 1)

80

Incorrect

Option 2)

87

Incorrect

Option 3)

90

Incorrect

Option 4)

97

Correct

Posted by

Plabita

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2024 Topper: Farmer’s son Gajare Nilkrishna says ‘keep questioning until you understand’
anam-khan

NIT Puducherry Cut-off 2024: Computer Science and Engineering had highest closing rank last year
anam-khan

JEE Mains: Farmer's son from remote Maharashtra village aces exam

Latest Question