If 1/6 th in place of 1/12 th mass of the carbon atom is taken to be the relative atomic mass unit, the mass of 1 mol of a substance will

The change in the relative atomic mass from 1/12 to 1/6 th of the mass of a carbon atom will only halve the relative atomic and molecular masses. For example, the atomic mass of H will be 0.5 instead of 1.0, Since there is no change in the definition of the mole (the number of atoms contained in 12g of C-12), the molar masses will not change. Of course, the molar mass (in grams) will no longer be numerically equal to the atomic or molecular mass. The molar mass (in g) of a substance will be numerically equal to double its atomic (for atoms) or molecular mass (for molecules).