Step-by-step explanation:
We have to find the molar mass of Au(OH)₃. To do that we have to look for the atomic masses of each element. Also we have to consider that one molecule of
Au(OH)₃ has 1 atom of Au, 3 atoms of O and 3 atoms H.
atomic mass of Au = 196.97 amu
atomic mass of O = 16.00 amu
atomic mass of H = 1.01 amu
molar mass of Au = 196.97 g/mol
molar mass of O = 16.00 g/mol
molar mass of H = 1.01 g/mol
molar mass of Au(OH)₃ = 1 * molar mass of Au + 3 molar mass of O + 3 molar mass of H
molar mass of Au(OH)₃ = 1 * 196.97 g/mol + 3 * 16.00 g/mol + 3 * 1.01 g/mol
molar mass of Au(OH)₃ = 248.0 g/mol
Answer: the molar mass of Au(OH)₃ is 248.0 g/mol.