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Results tagged with physical-chemistry
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user 19290
The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.
1
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2
answers
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Kinetics and Half Lives Using Pressure
For a certain first-order gas-hase reaction
$$\ce{A \rightarrow B + C}$$
the time required for half of an initial amount of A to decompose is 8.8 min. If the initial pressure of A is 400 mmHg, the ti …
- 1,143
9
votes
2
answers
1k
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Assuming ideal gas behavior, how can I tell when the change in enthalpy is equal to the chan...
If ideal gas behavior is assumed, for which of the following reactions does $\Delta H = \Delta U$?
\begin{align}
\tag{a} \ce{N2O4 &-> 2 NO2(g)}\\
\tag{b} \ce{CH4(g) + 2 O2(g) &-> CO2( …
- 1,143
4
votes
3
answers
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What happens when butane and methane both absorb 100 J of heat?
Two cylinders, one containing 1 mole of $\ce{C4H10}$ gas at $\pu{1 atm}$ and the other containing 1 mole of $\ce{CH4}$ gas at $\pu{1 atm}$, are at $\pu{288 K}$. If each gas absorbs $\pu{100 J}$ of …
- 1,143
2
votes
1
answer
94
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Equilirium mixture of nitrogen dioxide and its dimer
When an equilibrium mixture of gaseous, colorless $\ce{N2O4}$ and brown $\ce{NO2}$ is warmed at constant volume, which of the following is correct?
The density remains constant.
The degre …
- 1,143
5
votes
2
answers
29k
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Calculating Enthalpy Changes at Different Temperatures
To calculate $\Delta H$, the change in enthalpy at $\mathrm{100^\circ C}$ for the reaction below, one needs what addition information?
$$\ce{N2(g) + 3H2(g) -> 2NH3(g)}$$
$\Delta H^\circ = …
- 1,143