Mass proton =1.007825uMass neutron 1.008665uWhat is the sum of the mass of the constituent 12C6 atom. I?

Question

Ignore mass of electron.

Answer 1

Carbon — Atomic Mass: 12.0107 Amu........... thats of 12C6

But u ask of sum of masses neglecting electron ,that will be:
=6*mass of proton + 6*mass of neutron
=6*1.007825 + 6*1.008665
=6.04695 + 6.05199
=12.09894 amu

remember this is not the atomic mass of 12C6; besides i also have neflected the mass defect converted into binding energy

Answer 2

Sum of masses of 12c6 constituent = total mass of proton+ total mass of neutron + total mass of electron

Since u said ignoring mass of electron , so

There are total 6 proton and 6 neutron in 12c6 atom.
Mass of 1 proton =1.007825 u
Mass of 6 proton= 1.007825*6=6.04695u

Mass of 1 neutron= 1.008665u
mass of 6 neutrons-= 1.008665 * 6 = 6.05199

thus total mass = 6.04695u+ 6.05199 u
=12.09894u