Greatest lattice energy?

Cu(NO3)2 or Cr(NO3)3

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane

A. pipe, good luck, hope you get it right