Q. A 2.50 mol sample of helium gas initially at 300 K and 0.400 atm is compressed isothermally to 1.30 atm. Note that the helium behaves as an ideal gas.
Q. What percent error is introduced by weighing a Styrofoam block in air, which exerts an upward buoyancy force, rather than in vacuum? The density of air is 1.2 {rm{ kg/m}}^3.