Question

Mass of 1 mole neutrons $(m_n=1.675\times {10}^{-27}kg)$ is:

• A. $1.8\times {10}^{-3}kg$
• B. $1.008\times {10}^{-4}kg$
• C. $1.08\times {10}^{-3}kg$
• D. $1.008\times {10}^{-3}kg$

Answer 1

The correct option is D $1.008\times {10}^{-3}kg$

Mass of one neutron $=1.675\times {10}^{-27}$ kg

1 mole contains $6.02\times {10}^{23}$ neutrons

mass of 1 mole neutrons $=1.675\times 6.02\times {10}^{-27}\times {10}^{23}$

$=1.008\times {10}^{-3}$ kg