posted by Unknown .
calculate the number of molecules in 200 gm of caco3.
mol wt of CaCO3 is 100g
so, 200g = 2 moles = 2*6.02*10^23 molecules.
reason for _______ earth is tilted 23 1/2 from a line perpendicular to its orbit, the length of daylight varies and because of the angle at which the sun's energy strikes a given location through the years