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1. Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described by the chemical equation
MnO2(s)+4HCl(aq)?MnCl2(aq)+2H2O(l)+Cl2(g)
How much MnO2(s) should be added to excess HCl(aq) to obtain 125 mL Cl2(g) at 25 °C and 1.10×102 kPa ?
2. Calculate the pressure of a gas at 283 K if the concentration is 0.150 mol/L .
3. Calculate the density, in grams per liter, of a gas at STP if 1.39 L of the gas at 20.3 °C and 779.4 mmHg weighs 0.380 g.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HNO3
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