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For  system containing 2N electrons, a CIS calculation is done, using a basis set that contains 2M basis set functions.
1)How many MOs (occupied and virtual ,combined)would this calculation produce?
2)How many singly-excited determinants would this calculation contain? Give a formula in terms of N and M


The geometry optimization of the water molecule, done with HF/6-31+G*, gives R(O-H)=0.948A, <(H-O-H)=106.0¡ã£¬ and the following partial charges:Q(O)=-0.8e, Q(H)=+0.4e.Based on this data, calculate the dipole moment of H2O and compare it to the experimental value. How can you improve the computational result?

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