Question

If we consider $\frac{1}{6}$, in place of $\frac{1}{12}$, the mass of carbon atom to be the relative atomic mass unit, the mass of one mole of substance will:
(A) be a function of the molecular mass of the substance
(B) remain unchanged
(C) increase two fold
(D) decrease twice

Answer 1

If $\frac{1}{6}$ is considered as standard instead of $\frac{1}{12}$ then the atomic weights of elements will become half of the previous values. So molar mass also decreases twice. For example water:
Atomic weights of H and O in $\frac{1}{12}$ scale is 1 and 16 respectively.
But they will be 0.5 and 8 in $\frac{1}{6}$ scale. So new molar mass of water will be $1+8=9=\frac{1}{2}\left(18\right).$