Question

The weight of one hydrogen atom is:

• A. $1.66\times {10}^{-27}kg$
• B. $2.66\times {10}^{-27}kg$
• C. $1.76\times {10}^{-27}kg$
• D. $1.66\times {10}^{-37}kg$

Answer 1

Answer: (A)

$1.66\times {10}^{-27}kg$

Imol $=6.022\times {10}^{23}$ atoms

Molar mass of hydrogen $=1.008$ g/mol

$6.022\times {10}^{23}atom\to 1.008g/mol$

$1atom\to \frac{1.008}{6.022\times {10}^{23}}g$

$=0.1673\times {10}^{-23}g$

$=1.673\times {10}^{-24}g$

mass of 1 atom of hydrogen $=1.673\times {10}^{-27}kg.$