How many moles of o2 are needed to prepare 10.0 g of Ca(NO3)2

0.09 moles of sodium sulfate in 12 ml of solution

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp