A5.00 ml sample of h3po4 solution of unknown concentration is titrated with a 0.1090 m naoh solution. a volume of 7.12 ml of the naoh solution is required to reach the equivalence point. what is the concentration of the unknown h3po4 solution?

The answer is that first you add 5.00+7.12=12.12

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.