Question

An element whose gram-atomic mass and gram-molecular mass are the same is:
(A) hydrogen
(B) oxygen
(C) nitrogen
(D) helium

Answer 1

Answer:

(D) helium

Explanation:

The gram atomic mass and gram molecular mass of helium will be equal. As the molecule is a group of two or more atoms. All the element given in the option, their molecule are diatomic except helium. Helium is a stable atom which doesn't form a molecule. As helium exists as a mono-atomic molecule. Hence,gram-atomic mass and gram-molecular mass of helium is the same. So, option D is correct.