Define end point. 12 gm of commercial zinc is made to react with excess dil H2SO4. The total volume of H2 gas liberated was found to be 4.2 litres at 570 mm of Hg pressure and 279 K. Determine the percentage purity of the Zinc. (Non-anonymous question ).
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The zinc sample was 74.96% pure. According to reaction 1 mol of hydrogen gas was produced form 1 mol of zinc. Then 0.1376 mol of hydrogen gas will be produce by: of zinc.
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