Questions tagged [enthalpy]

A thermodynamic state function describing the total energy content of a system.

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What is the enthalpy change of solution of oxygen and water? [closed]

What is the enthalpy change of solution of oxygen dissolved into water?
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1answer
127 views

Significance of pV work in enthalpy [closed]

If we already have $pV$ work included in the internal energy $U = q + w,$ then what is the $pV$ work in the equation for enthalpy $H = E + pV?$
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How to determine the formula for calculating the enthalpy change of a reaction? [closed]

$$\ce{4 HCl(g) + O2(g) -> 2 Cl2(g) + 2H2O(g)}$$ In the reaction above, knowing the enthalpy of formation of each individual compound, in order to calculate the standard enthalpy change of the ...
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1answer
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Enthalpy of formaton [closed]

today I was doing a set of HW problems regarding enthalpy and stumble upon one problem that I found confusing.It was the standard enthalpy of formation for CaCO3 is -1207.6 kJ mol when 30.7 g of ...
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1answer
303 views

Why is the reaction enthalpy the same as change in enthalpy for each of the reactants and products?

How come the $\Delta H$ of the reaction is the same $\Delta H$ for each of the reactants and products? For example, in an equation, the $\Delta H$ of the reaction is $244 \,\mathrm{kJ}$. When my ...
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1answer
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Chemistry 12: Calculating changes in enthalpy [closed]

I was wondering if I could please get some help with this: In a coffee-cup calorimeter $\pu{100.0 mL}$ of $\pu{1.0 M}\ \ce{NaOH}$ and $\pu{100.0 mL}$ of $\pu{1.0 M}\ \ce{HCl}$ are mixed. Both ...
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1answer
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Reactions with a positive Delta H and a negative Delta S are said to be nonspontaneous at ALL temperatures. But what if the temperature IS low enough? [closed]

What I mean is, that if you use G = H-TS and make the temperature low enough, couldn't you make any reaction spontaneous? For example, you have a Delta H of 85 kJ and a Delta S of -66 J/K. I've been ...
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0answers
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Homemade Flash Paper [closed]

I am making homemade flash paper (nitrocellulose) and had a question regarding the safety and stability of the mixture. I have purchased a respirator, beakers, stirring rods ect so i stay safe. After ...
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1answer
66 views

Enthalpy of reaction [closed]

Please someone help me with this question How is d possible?

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