Question

16.26 mg of sample of an element X contains 1.66x10²⁰ atoms. what is the atomic mass of X?

Answer 1

Dear ​Student,

$$\begin{gathered} 1moleatom=6.023\times {10}^{23}atoms=atomicwt. \\ 1.66\times {10}^{20}=16.26\times {10}^{-3}g \\ so6.023\times {10}^{23}=\frac{6.023\times {10}^{23}\times 16.26\times {10}^{-3}}{1.66\times {10}^{20}}=58.996g \\ Answeris59g/molistheatomicwt.ofelement \\ Regards \end{gathered}$$