Percent Copper in Cu2(NO3)(OH)3

Question

Trying to find the percent copper in many different variations of Copper Hydroxyl Nitrate 

Answer 1

The % copper (by weight) will be the mass of copper/mass of compound (x100%).

For Cu₂(NO₃)(OH)₃ the molar mass = 240.1189 g/mol

Each Cu has a mass of 63.546 g and 2x 63.546 g = 127.092 g Cu

% Cu = 127.092/240.1189 (x100%) = 52.9288% Cu