Need asap with this chemistry if someone could me

1.) which of the following contains both ionic and covalent bonds? which are purely ionic? which have only covalent bonds?

h3po4
kno3
nh3
kcl
co2

2.) put these compounds in order of increasing lattice energy:

bas rbf aln

3.) rank the following compounds from smallest to largest lattice energy. (lowest to highest melting point.)

cao, csi, bas, naf, nacl

4.) what is the key conclusion we arrive at by analyzing the electrostatic forces involved in bonding

5.) find the average bond lengths of each of these. then put them in order of increasing bond length.

n—n, n=n, n≡n