Given the balanced equation representing a reaction:

2c2h6 + 7o2==> 4co2 + 6h2o

determine the total number of moles of oxygen that react completely with 8.0 moles of c2h6.

2 C₂H₆ + 7 O₂ = 4 CO₂ + 6 H₂O

2 moles C₂H₆ 7 moles O₂
8.0 moles C₂H₆ ? moles O₂

moles O₂ = 8.0 * 7 / 2

moles O₂ = 56 / 2

= 28 moles of O₂

hope this helps!

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.