A container has four gases is pumped in the total pressure of the gases is 4.80 ATM. If the pressure of the first gas is 1.20 ATM and the pressure of the second gas is 0.490 atm, the pressure of the third gas is 0.780atm, what is the pressure of the fourth gas in the atmospheres

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /