Physical Chemistry Answers

Determine the total pressure of a gas mixture that contains oxygen at a pressure of 150. mmHg, nitrogen at 350.mmHg pressure, and helium at a pressure of 200.mmHg. Give your answer in mmHg and in atm.

Please calculate the amount of energy it will take to change 25.0 Grams of Water from -6 C to changing it all to vapor at sea level. Show all your work for credit.




Please calculate the amount of energy it will take to change 25.0 Grams of Water from -6 C to changing it all to vapor at sea level. Show all your work for credit.

heat of fusion of water = 334 J/g

heat of vaporization of water = 2257 J/g

specific heat of ice = 2.09 J/g·°C

specific heat of water = 4.18 J/g·°C

What is the concentration (M) of a NaCl solution prepared by dissolving 5.3 g of NaCl in sufficient water to give 115 mL of solution?

What are the equilibrium concentrations of H2SO3, H+, HSO3−, and SO32−in a 0.050 M solution of sulfurous acid H2SO3 at 25 oC? For H2SO3 at 25 oC, Ka1 = 1.5×10−2 and Ka2 = 1.0×10−7

A weak acid HA is 1.0% dissociated in a 1.0 M solution. What would its percent dissociation be in a 5.0 M solution?

Solid calcium hydroxide, Ca(OH)2, is dissolved in water until the pH of the solution is 10.23. What is the concentration of calcium ion [Ca2+]?

What are the equilibrium concentrations of H2SO3, H+, HSO3−, and SO32−in a 0.050 M solution of sulfurous acid H2SO3 at 25 oC? For H2SO3 at 25 oC, Ka1 = 1.5×10−2 and Ka2 = 1.0×10−7

4.35 g of a sample of pyrolusite when heated with conc. HCl gave chlorine. The chlorine then passed through KI solution liberated 6.35 g of iodine . Then% purity of the pyrolusite sample is?

How many grams of carbon dioxide are produced if 19.8 liters of CO are used at STP?