Question
The ${H^ + }$ ion concentration is $1.0 \times {10^{ - 6}}$ mole/litre in a solution. Its $pH $ value will be
$pH = - \,\log \,\,[1.00 \times {10^{ - 6}}]$; $pH = 6.$
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Given : $\Delta H _{ f }^{\ominus}\left( Al _2 O _3\right)=-1700\,kJ\,mol ^{-1}$
$\Delta H _{ f }^\theta\left( Fe _2 O _3\right)=-840\,kJ\,mol ^{-1}$
Molar mass of $Fe , Al$ and $O$ are $56,27$ and $16\,g\,mol ^{-1}$ respectively.
[Given $: R =8.31 \,J \,K ^{-1} \,mol ^{-1}, \log 1.33=0.1239$ $\ln 10=2.3]$