# Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HC1(aq), asdescribed by the chemical equationMnO,(s) + 4 HC1(aq)MnCl, (aq) + 2 H,O(1) + Cl,(g)How much MnO, (s) should be added to excess HC1(aq) to obtain 175 mL Cl, (g) at 25 °C and 775 Torr?mass of MnO,:

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Step 1

Given,

Volume of Cl2 gas, V = 175 mL = 0.175 L    (1 mL = 0.001 L)

Temperature, T = 25 °C = (25 + 273) K = 298 K

Pressure, P = 775 torr = 775/760 atm    (1 torr = 1/760 atm)

No. of moles (n) of Cl2 gas can be calculated using the ideal gas equation as:

Step 2

The balanced chemical reaction is given as:

MnO2 (s) + 4 HCl (aq) → MnCl2 (aq) + 2 H2O (l) + Cl2 (g)

From the given reaction, it is evident that :

Step 3

Mass of MnO2 required can be ...

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