Question
Calculate the molarity of a solution containing 5 g of NaOH dissolved in the product of H _2- O _2 fuel cell operated at 1 A current for 595.1 hours. (Assume F =96500 C / mol of electron and molecular weight of NaOH as .40 ~g ~mol ^ -1 ).
BITSAT
Chemistry
Electrochemistry
2024
BITSAT 2024 (Memory Based Paper 3)
BITSAT Chemistry Question (2024) — Solution
Options
- A. 0.625 M
- B. 0.05 M
- C. 0.1 M
- D. 6.25 M
Answer
A. 0.625 M
Step-by-step solution
The overall reaction of H _2- O _2 fuel is, 2 H _2+ O _2 2 H _2 O Thus 4 ~F =4 96500 C produce water =2 ~mol =36 ~g aligned Charge actually passed & =i t \\ & =1 595.1 60 60 \\ & =2142360 C aligned aligned & Water produced = 36 4 96500 2142360 \\ & 200 ~g or 200 ~mL \\ & Molarity of NaOH solution = 5 40 1 200 1000 \\ & =0.625 M aligned
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