Question

What percentage of the mass of a carbon-12 atom is

contributedby its electrons? Given the mass of an electron is
(1/1836)amu.

Answer 1

% of mass of electrons in C = 0.0272

Step-by-step explanation:

Atomic no. of carbon = 6

So, no. of electron = 6

Mass of an electron =
`(1)/(1836) amu`

Mass of 6 electrons =
`6 * (1)/(1836) = 0.003268 amu`

Mass of C = 12.0107 u

% of mass of electrons in C =
`(Mass\ of\ all\ electrons)/(Mass\ of\ C)* 100`

% of mass of electrons in C =
`(0.003268)/(12.0107)* 100=0.0272 \%`