Ta có: \(PTK_{Al_x\left(SO_4\right)_3}=342\left(đvC\right)\)
\(\Leftrightarrow27x+3\times\left(32+16\times4\right)=342\)
\(\Leftrightarrow27x+288=342\)
\(\Leftrightarrow27x=54\)
\(\Leftrightarrow x=2\)
\(\left(SO_4\right)_3=96+192=288\left(dvC\right)\)
=> x = \(\frac{342-288}{27}=2\)
PTK Alx(SO4)3=27×x+(32+16×4)×3=342 <=> 27×x+288=342 <=>342-288=27×x <=>54=27×x => x=54:27=2 VẬY x=2