- AMetals
- BMetalloids
- ✓Non-metals
- DTransition elements
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$4B(s) + 3O_2\,(g) \rightarrow 2B_2O_3\,(g)$ ; $E^o_{cell} = 1.433$ $volt$ What is molar entropy (in $J/K$) of oxygen gas
Given ${\left( {{\Delta _f}{H^o}} \right)_{{B_2}{O_3}}}\left( g \right) = - 840\,\frac{{KJ}}{{mol}}$
${\left( {S_m^o} \right)_{{B_2}{O_3}}} \left( g \right) = 280J/K - mol$
${{(S_{m}^{o})}_{B}}\,\,\left( s \right)=10\,J/K-mol$
$CH_3CH=CHCH_2CH(Br)CH_3$
$A$. A liquid evaporates to vapour.
$B$. Temperature of a crystalline solid lowered from $130 \mathrm{~K}$ to $0 \mathrm{~K}$.
$C$. $2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}$
$D$. $\mathrm{Cl}_{2(g)} \rightarrow 2 \mathrm{Cl}_{(g)}$
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