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Topic: Enthaply of formation  (Read 2274 times)

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Offline staga

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Enthaply of formation
« on: September 02, 2010, 05:16:09 PM »
Hello everyone,

I was wondering if anyone could help me with this question...

sodium bicorbonate is heated and decomposes into sodium carbonate, water vapour and CO2. The deltaH for this reaction is +64.6 kJ/mol.

Using enthalpys of formation, calculate the enthalpy of formation of sodium bicarbonate.

So far ive only come uo with a balanced equation..

NaHCO3+ heat→ 1⁄2 Na2CO3+ 1⁄2 H2O + 1⁄2 CO2    ∆H=+ 64.6 kJ/mol

Thanks,
-Dan

Offline ContinuousProcess

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Re: Enthaply of formation
« Reply #1 on: September 03, 2010, 12:58:04 AM »
Using enthalpys of formation,

Use the enthalpies of formation. (For the other species involved.)

After it's a simple game of addition.

Offline opti384

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Re: Enthaply of formation
« Reply #2 on: September 03, 2010, 03:22:22 AM »
The overall enthalpy of the reaction will be [those of the products] - [those of the reactants].

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