a sample of saline solution has a mass of 165.0g. it is placed in a 54.3g evaportaing dish. after evaporation the dish and its contents have a mass of 56.7 g what is the percentage by mass of sodium chloride in the solution

Answer(false);

The answer is ax3. hope this

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.