A certain element has a mass per mole of $54\mathrm{.}9380\frac{g}{m}ol.$ What is the mass of a single atom in $($a$)$ atomic mass units and $($b$)$ kilograms?

$($c$)$ How many moles of atoms are in a $312-g$ sample?

$($a$)m_{\text{a}\text{t}\text{o}\text{m}}=$

$($b$)m_{\text{a}\text{t}\text{o}\text{m}}=kg$

$($c$)n=$