The mass of a mole of proton and electron is
A. 1.007g and 0.55 mg
B.$9.11\times {10}^{-28}kgand9.1\times {10}^{-28}kg$
C. 2gm and 2gm
D.$6.023\times {10}^{23}gand6.023\times {10}^{23}g$

The correct option is A 1.007g and 0.55mg

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

Mass of one mole of electrons = $9.11\times {10}^{-28}\times 6.022\times {10}^{23}=54.8\times {10}^{-5}g=0.55mg$

Mass of a proton = $1.672\times {10}^{-24}$g
Mass of one mole of protons = $1.672\times {10}^{-24}\times 6.022\times {10}^{23}=1.007gm$