Question

Mass of one atom of an element is `2.66xx10^(-23)g`. This mass is equal to
A. 16 amu
B. `2.39xx10^(-9)J`
C. Both are correct
D. None is correct

Answer 1

Correct Answer - C
1 a.m.u. `= (1)/(2)xx(12)/(6.02xx10^(23))g`
`(1)/(6.02xx10^(23))g`
`2.66xx10^(-23)xx((6.02xx10^(23)amu)/(1g)) = 16` a.m.u.
`E = mc^(2)`
`E = (2.66xx10^(-26)kg)(2.998xx10^(8)ms^(-1))^(2)`
`= 23.91xx10^(-10)J = 2.39xx10^(-9)J`