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Question

To prepare one gram of hydrogen molecules using hydrochloric acid, how many grams of zinc should be taken?

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Solution

Zn+2HClZnCl2+H2

The gram atomic mass of zinc is =65 g and Gram molecular mass of Hydrogen =2 g From the above equation we can understand that 65 g of zinc gives 2 g of hydrogen molecules. To prepare 1 g of hydrogen molecules we need 32.5 g of zinc.

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