When the following is balanced, c₄h₁₀ + o₂ → co₂ + h₂o, what is the coefficient of co₂?
a. 2
b. 4
c. 8
d. 10
e. 13

It should looks like this

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.