If a molecule demonstrates paramagnetism, then : I. The substance can have both paired and unpaired electrons. II. The bond order is not a whole number. III. It can be determined by drawing a Lewis structure. IV. It must be an ion.

The bond order is not a whole number.

Explanation:

If a molecule is paramagnetic, then there are unpaired electrons in some of its molecular orbitals. This will cause the bond order not to be a whole number when treated by applying the ordinary molecular orbital theory to the molecule.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o