4. An electron in which of the following orbitals of the hydrogen atom has the largest average distance from the nucleus? (A) 1s (B) 2s (C) x 2 p (D) z 2 p

3. An impure sample of K2O was analyzed by precipitating the potassium as theinsoluble tetraphenyl borate salt, KB(C6H5)4. The precipitate, KB(C6H5)4 has amass of 3.14 g. What is the mass of K2O in the original sample? (Molar masses:KB(C6H5)4 = 358.3 g and K2O = 94.2 g) (3%)(A) 0.413 g (B) 0.826 g(C) 1.651 g (D) 2.423 g(E) None of the above