The question requires us to calculate the molecular mass of the compound tantalum carbide (TaC), considering the atomic masses to the nearest tenth of a gram.
Considering the molecular formula provided by the question, TaC, we can calculate the molecular mass from the atomic masses of Ta (180.9 u) and C (12.0 u):
molecular mass (TaC) = 180.9 * 1 + 12.0 * 1 = 192.9 g/mol
Therefore, the molecular mass of the structure TaC is 192.9 g/mol.