Why do planets in our solar system stay in their positions

a)the sun’s gravity keeps them in place.

b)the sun’s radiation keeps them there.

c)friction with the atmosphere keeps them from escaping.

d)they travel the same distance from each other.

Which one of the following substances would be the most soluble in ccl4? na2so4 h2o ch3ch2ch2ch2oh c4h10 hi

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.

Calculate the mass of 0.750 mol of the following substance. na3po4.