Molar mass related doubts

Question

Compare and explain the molar masses of deuterium and helium.

Answer 1

A helium nucleus contains roughly twice as many protons and neutrons as a deuterium nucleus, so it has double the molar mass.

The molar mass of a deuterium atom is approximately 2.014 g/mol and the molar mass of a helium atom is approximately 4.003 g/mol

Answer 2

Deuterium has 1 electron, 1 proton and 1 neutron. Helium has 2 of each. He is double the mass of D.