Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al2(SO4)3. Given that $\mathop \Lambda \limits^ \circ $Al3+ and $\mathop \Lambda \limits^ \circ $so$_4^{2 - }$ are the equivalent conductances at infinite dilution of the respective ions?
$2\mathop \Lambda \limits^ \circ $Al3+ + $3\mathop \Lambda \limits^ \circ $so$_4^{2 - }$
$\mathop \Lambda \limits^ \circ $Al3+ + $\mathop \Lambda \limits^ \circ $so$_4^{2 - }$
($\mathop \Lambda \limits^ \circ $Al3+ + $\mathop \Lambda \limits^ \circ $so$_4^{2 - }$) $ \times $ 6
${1 \over 3}$$\mathop \Lambda \limits^ \circ $Al3+ + ${1 \over 2}$$\mathop \Lambda \limits^ \circ $so$_4^{2 - }$
