A chemist will prepare a stock solution of HCl so that 27.15 mL stock samples will produce a solution with a concentration of 0.357 M after 741.25 mL of water is added. What should the molarity of the stock solution be?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3