A lead storage battery consists of a lead anode and a grid of lead packed with lead dioxide as the cathode. The electrolyte taken is 39% `H_(2)SO_(4)` by mass having a density of 1.294 g `mL^(-1)`. The battery holds 3.5 L of the acid. During the discharge of the battery, the density `H_(2)SO_(4)` falls from 1.294 g `mL^(-1)` to 1.139 g `mL^(-1)` which is 20% `H_(2)SO_(4)` by mass Q. Moles of sulphuric acid lost during discharge isA. 9.88B. 8.88C. 2.32D. 1.16

A lead storage battery consists of a lead anode and a grid of lead pac

1.	A lead storage battery consists of a lead anode and a grid of lead packed with lead dioxide as the cathode. The electrolyte taken is 39% `H_(2)SO_(4)` by mass having a density of 1.294 g `mL^(-1)`. The battery holds 3.5 L of the acid. During the discharge of the battery, the density `H_(2)SO_(4)` falls from 1.294 g `mL^(-1)` to 1.139 g `mL^(-1)` which is 20% `H_(2)SO_(4)` by mass Q. Moles of sulphuric acid lost during discharge isA. 9.88B. 8.88C. 2.32D. 1.16
Answer» Correct Answer - A Mass of the solution before discharge `=3500mLxx1.294" g "mL^(-1)=4529g` mass of `H_(2)SO_(4)` present in this solution `=(39)/(100)xx4529g=1766.31g` mass of the solution of after discharge `=3500mLxx1.139" g "mL^(-1)=3986.5g` mass of `H_(2)SO_(4)` present in this soluton, `=(20)/(100)xx3986.5=797.3g` Loss in mass of `H_(2)SO_(4)` during discharge `=1766.31-797.3=969.01g` Moles of `H_(2)SO_(4)` lost during discharge `=(969.01)/(98)=9.88786`

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