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    Chlorine Gas Preparation

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    Chlorine gas can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid:
    MnO2(s) + 4HCl(aq) --> MnCl2(aq) + 2H2O(l) + Cl2(g)

    How much MnO2 should be added to excess HCl to obtain 275mL of chlorine gas at 5.0C and 650 mmHg?

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    Solution Preview

    Use the ideal gas law to find the number of moles of chlorine gas.

    Pressure in atm = 650 mmHg (1 atm/760 mmHg) = 0.855 atm

    number of moles Cl2 = PV/RT = [(0.855 ...

    Solution Summary

    This complete solution uses the ideal gas law to do calculations and find the answer.