Question

The molecular weight of a hydrogen atom is _______ kg.

• A. $1.76\times {10}^{-27}kg$
• B. $1.73\times {10}^{-27}kg$
• C. $1.66\times {10}^{-27}kg$
• D. none of these

Answer 1

The correct option is C $1.66\times {10}^{-27}kg$

The molecular weight of hydrogen is $1amu$ as it has only $1$ proton and no neutron.

Atomic mass = Number of protons + Number of neutrons

$\therefore$ Atomic mass of hydrogen=$1$

To convert it into $Kg$ multiply by $1.66\times {10}^{-27}Kg$

$=1amu\times 1.66\times {10}^{-27}Kg$

$=1.66\times {10}^{-27}Kg$