Question

is known that atom contain protons, neutrons and electrons. If the mass of neutron is assumed to half of its original value whereas that of proton is assumed to be twice of its original value then the atomic mass of 146C will be:a) same b) 14.28 % less c) 14.28 % more d) 28.56 less

Answer 1

¹⁴C₆

Number of protons = 6 , mass of protons = 6 amu

Number of neutrons = 8, mass of neutrons = 8 amu

Mass of ¹⁴C₆ = 6 + 8 = 14 amu

When mass of neutrons is halved and mass of protons is doubled, mass of ¹⁴C₆ becomes 8/2 + 6 x 2 = 16 amu

Percentage by which the mass has increased = (16-14)/14 x 100

= 14.28 %

Hence, mass of ¹⁴C₆ is 14.28 % more.