16.26 milligram of sample of an element X contains `1.66 xx 10^(20)` atoms. What is the atomic mass of the element X ?

Answer

59 g

Explanation

`1.66 xx 10^(20)` atoms X have mass = 16.26 mg
`6.022 xx 10^(23)` atoms of X have mass `= ((6.022xx10^(23)"atoms"))/((1.66xx20^(20)"atoms"))xx(16.26mg)`
`=59.0xx10^(3)mg=59.0g`.