Question

The product of mass of a mol of proton and electron is:

• A. $6.023\times {10}^{23}g$
• B. $1.008g\times 0.55mg$
• C. $9.1g\times {10}^{-28}kg$
• D. $2gm$

Answer 1

The correct option is B $1.008g\times 0.55mg$

Mass of a proton $=1.673\times {10}^{-24}g$

$\therefore$ Mass of one mole of proton

$=9.1\times {10}^{-24}\times 6.02\times {10}^{23}=10.07\times {10}^{-1}=1.008g$

Mass of a electron $=9.1\times {10}^{-28}g$

$\therefore$ Mass of one electron

$=9.1\times {10}^{-28}\times 6.02\times {10}^{23}=54.78\times {10}^{-5}g=0.55mg$.

Product of mass of a mol of proton and electron $=1.008g\times 0.55mg$