Number of moles in 145.7 g of squaric acid

To find moles : moles= Mass (C₄H₂O₄) / RFM (C₄H₂O₄)

so moles = 147.7 / 114 = 1.2956mol

hope that 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.