Two moles of helium gas initially at 438 k and 0.44 atm are compressed isothermally to 1.61 atm. find the final volume of the gas. assume that helium behaves as an ideal gas. the universal gas constant is 8.31451 j/k · mol.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.