A sealed flexible container holds 4.0 L of helium gas at 200. K and 1.0 atm. The container is warmed until the gas temperature reaches 400. K, while the pressure remains at 1.0 atm. What is the new volume of the gas?

A water sample contains 5 mg of dissolved chloride ions per liter of solution. This concentration is equivalent to:

Which type of radioactive emission has NO mass and NO charge, consisting of high-energy electromagnetic radiation?

What is the molarity of a solution that contains 0.500 mol of NaCl dissolved in enough water to make 250 mL of solution?

The reaction 2 H₂(g) + O₂(g) → 2 H₂O(l) is best classified as which type of reaction?