Answer
$\begin{matrix}
Part & Element & Atomic\ weight & Mass\ of\ 1\ mol \\
a) & Sn & {118.710} &{118.710\ g}\\
b) & {Br} & 79.904&\ {79.904\ g}\\
c) & Mg&{24.305}&{24.305\ g}\\
d) & {Cr}&{51.9961}&51.9961\ g
\end{matrix}$
Work Step by Step
$\begin{matrix}
Part & Element & Atomic\ weight & Mass\ of\ 1\ mol& Comments \\
a) & Sn & \bf{118.710} &\bf{118.710\ g}&*(1), *(2)\\
b) & \bf{Br} & 79.904&\ \bf{79.904\ g}&*(2), *(3)\\
c) & Mg&\bf{24.305}&\bf{24.305\ g}&*(1),*(2)\\
d) & \bf{Cr}&\bf{51.9961}&51.9961\ g&*(2),*(3)
\end{matrix}$
*(1): Look at the periodic table for the element with this symbol to get its atomic weight.
*(2) The mass of 1 mole is the atomic weight in g
*(3) Look for the element with this atomic weight. To make things easier, remember that the atomic weights increase from left to right and from top down in the periodic table.
