A sample of crushed rock is found to have 4.81 x 10^21 atoms of gold, how many moles of gold are present in this sample? A. 7.99 x 10^-3 moles
B. 1.57 x 10^-1 moles
C. 1.25 x 10^3 moles
D. 2.47 x 10^5 moles

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

What happens to the atomic radius when an elctron is lost