A tank contains helium gas at 490 mmHg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total pressure in atm?

• At STP, what is the volume of 4.50 moles of nitrogen gas?
• A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 °C?
• The gas with an initial volume of 24.0 L at a pressure of 565 torr is compressed until the volume is 16.0 L. What is the final pressure of the gas, assuming the temperature does not change?
• The number of valence electrons found in an atom of a Group A element is equal to ________.
• Which of the following is not part of the kinetic theory of gases?
• A solution that has pH = 14 is classified as _________.
• We know that most solids are more soluble in warm water than in cold water. Does the solubility of NH4Cl fit this pattern?
• Pure chloroform CHCl3 has a normal boiling point of 61.17˙C. A solution is prepared by dissolving 12.5 g of CBr4 in 25.0 g of CHCl3
• Barley and wheat grains from an ancient source are found to contain an amount of carbon 14
• A 1.00 liter buffer consists of 0.350 M acetic acid and 0.275 M acetate. How many moles of NaOH can be added to this solution before it loses its capacity to buffer bases? Assume the addition of the NaOH does not change the volume.