To determine the subscripts in the molecular formula of the compound with a molecular formula mass of 210 amu, we need to consider the elements present and their respective atomic masses.

Let's assume the molecular formula is C_xH_yO_z.

Given the molecular formula mass is 210 amu, we can set up the equation:

12x + y + 16z = 210

Solving for x, y, and z requires additional information or constraints, such as the empirical formula or percentage composition of the compound. Without this information, we cannot determine the exact subscripts for C, H, and O.