Question

The mass of a mol of proton and electron is

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

Answer 1

Answer: (B)

$1.008g$ and $0.55mg$

Answer 2

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

∴ 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 $= 9.1 \times 10^{- 28}g$

∴ Mass of one mole of electron

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