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A-R-Q
 Post subject: [CHMA] Standard Enthalpies of Formation
PostPosted: Thu, 8 Dec 2011 19:38:22 UTC 
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Write equation for the formation of Pb(NO3)2.

Attempt:
Pb(s) + 2 NO3 (g) => Pb(NO3)2 (s) ?

This is using standard enthalpies of formation by the way. Do polyatomic ions stay together when writing out these formation equations?
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outermeasure
 Post subject: Re: [CHMA] Standard Enthalpies of Formation
PostPosted: Fri, 9 Dec 2011 08:40:24 UTC 
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A-R-Q wrote:
Write equation for the formation of Pb(NO3)2.

Attempt:
Pb(s) + 2 NO3 (g) => Pb(NO3)2 (s) ?

This is using standard enthalpies of formation by the way. Do polyatomic ions stay together when writing out these formation equations?


No! Every constituent element start with their standard states.

So it would be
\mathrm{{Pb}_{(s)}} + \mathrm{{N_2}_{(g)}} + 3\mathrm{{O_2}_{(g)}} \to \mathrm{{Pb(NO_3)_2}_{(s)}}
since these are the most stable form of lead, nitrogen, oxygen and lead(II) nitrate under standard condition.

_________________
\begin{aligned} Spin(1)&=O(1)=\mathbb{Z}/2&\quad&\text{and}\\ Spin(2)&=U(1)=SO(2)&&\text{are obvious}\\ Spin(3)&=Sp(1)=SU(2)&&\text{by }q\mapsto(\mathop{\mathrm{Im}}\mathbb{H}\ni p\mapsto qp\bar{q})\\ Spin(4)&=Sp(1)\times Sp(1)&&\text{by }(q_1,q_2)\mapsto(\mathbb{H}\ni p\mapsto q_1p\bar{q_2})\\ Spin(5)&=Sp(2)&&\text{by }\mathbb{HP}^1\cong S^4_{round}\hookrightarrow\mathbb{R}^5\\ Spin(6)&=SU(4)&&\text{by the irrep }\Lambda_+\mathbb{C}^4 \end{aligned}
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