# How do you calculate the formula mass of aluminum carbonate?

Of $\text{aluminum carbonate}$, the formula mass is the sum of the individual atomic masses; approx. $234.08 \cdot g \cdot m o {l}^{-} 1$.
The formula mass of $A {l}_{2} {\left(C {O}_{3}\right)}_{3}$ $=$ {2xx26.98("Al")+3xx12.011("C")+9xx15.999("O")}*g*mol^-1} $=$ ??