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Question: How long will it take for a current of 3 Amperes to decompose 36 g of water? (Eq. wt. of hydrogen is...

How long will it take for a current of 3 Amperes to decompose 36 g of water? (Eq. wt. of hydrogen is 1 and that of oxygen 8)

A

36 hours

B

18 hours

C

9 hours

D

4.5 hours

Answer

36 hours

Explanation

Solution

Eq. wt. of H2O=1+8=9.H_{2}O = 1 + 8 = 9. Hence 9 g is decomposed by 96500 C. So 36 g of water will be decomposed by

Q=96500×4C\mathbf{Q = 96500}\mathbf{\times}\mathbf{4C}

Hencet=QI=96500×43S=128666.66sec.t = \frac{Q}{I} = \frac{96500 \times 4}{3}S = 128666.66sec. =35.7hrs35.7hrs36hrs.36hrs.