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How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes ? ( molar mass of calcium = `40 g mol^(-1)`)A. 0.5 FB. 1FC. 0.25 FD. 2F |
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Answer» Correct Answer - A 2 moles of electrons are required to deposit 1 mole of calcium. Mass of calcium deposited = 10g, Molar mass of calcium = 40 g `mol^(-1)` `therefore` No of moles = `10/(40 g "mol"^(-1)) = 0.25` mol 2F are required for 1 mole of calcium xF are required for 0.25 mole of calcium `therefore x = 0.25 xx 2 = 0.5 F` |
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