Astudent prepared a solution of nacl by dissolving 55.0g of sodium chloride in 570 ml of water. what is the percent by mass of the nacl solution?

How many molecules are in 6.0 moles of methane

The time that is taken by neptune once around the sun is called

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.