Asked by Drew

Now if your lab partner determined that there were 1.157 x 1020 atoms of Mn in an unknown sample of KMnO4, how many milligrams would the unknown sample weigh?
Answered by DrBob222
Was it pure? if so, there are 6.02E23 atoms in a molecule; therefore, there are
1.157E20 molecules x (1 mol/5.02E23) = ? mols KMNO4.
mols KMnO4 x molar mass = grams KMnO4 = ?
Convert to mg.