$($Note: the periodic table on the back cover, Appendix A and Appendix B of the Askeland text may be useful.$)$

a$.$ The number of moles of $Bi($bismuth$)$ in $910$ grams.

b$.$ The mass, in $kg,$ of $27\mathrm{.}4{10}^{26}$ atoms of $Fe($iron$).$

c$.$ If stacked linearly, end to end, the number of Ti $($titanium$)$ atoms to span $1\mathrm{.}00in.$

d$.$ The melting point of $Au($gold$)?$