Let mass of electron is half,mass of protons is two times and mass of neutron is three fourth of original masses then new atomic weight of oxygen atom changes by what percent
Answers
Answer : The new atomic weight of oxygen atom changes by 37.5%
Explanation :
The mass of electron is negligible as compared to that of proton and neutron. Therefore we will neglect the change in the mass of electron.
Mass of proton is 1 amu and mass of neutron is 1 amu.
Oxygen atom contains 8 protons and 8 neutrons.
Mass of O atom = 8p + 8n
Mass of O atom = 8 x 1 amu + 8 x 1 amu = 16 amu
Original mass of O atom is 16 amu.
Mass of proton becomes two times of its original.
Therefore new mass of proton is 2 amu
Mass of neutron changes to 3/4 of its original.
Therefore new mass of neutron is 0.75 amu.
New mass of O atom = 8p + 8n
New mass of O atom= 8x 2amu + 8 x 0.75 amu
New mass of O atom = 22 amu.
The new mass of oxygen atom would be 22 amu.
% increase in the mass can be calculated as
% increase = Change in mass / Original mass
% increase =
% increase = 37.5%
The mass will increase by 37.5%