A mole of a compound contains $54g$ of $Al$ atoms, $1.806$ $\times {10}^{24}$ of Sulphur atoms and $192g$ of oxygen atoms. The molecular formula of the compound is?
[ $Al=27,S=32$, $O=16,N_A=6.02\times {10}^{23}]$

A. $AlS{O}_3$
B. $A{l}_2{S}_2{O}_2$
C. $A{l}_{2}S{O}_2$
D. $A{l}_2{\left(S{O}_4\right)}_3$  

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Correct Answer: D