Chlorine can be prepared by the reaction MnO2+4HCl-MnCl2+Cl2+2H2O.
How many grammes of HCl are required to react with 25g of MnO2?
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Avagardo's law
57g of MnO2 gives 288g of HCL
25g of MnO2 gives 126.31g of HCL
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