2017年3月江西计算机等级考试什么时候出成绩？
百度 中国全国总工会联合国家卫计委等10部门于2016年联合下发《关于加快推进母婴设施建设的指导意见》，要求进一步扩大女职工休息哺乳室覆盖面，推动到2020年底，所有应配置母婴设施的用人单位基本建成标准化的母婴设施。
Physical and chemical laws describing the properties and behavior of gases. This tag currently applies to properties and laws concerning both ideal and real gases.
10 questions from the last 365 days
4
votes
1
answer
203
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When does the minima of PV vs P graph for a van der Waals gas occur at a given temperature?
I need help in maths and not chemistry this time.
Here's the problem statement:
The pressure (in atm) at which the $PV$ vs $P$ curve acquires minima for one mole of oxygen gas at $\pu{0^\circ C}$, is ...
- 1,087
0
votes
2
answers
78
views
Pressure in mechanical and gaseous contexts
In school, our teacher described pressure as force divided by area: P = F/A. When they introduced Boyle's Law, they described it as pressure being inversely proportional to volume i.e P = k/V.
In this ...
- 27
-4
votes
2
answers
64
views
How can the volume of container ever be less than the volume available for molecule?
We assume $V_\mathrm{ideal}$ to be the volume available for molecule to freely move and $V_\mathrm{real}$ to be the volume of container and
$$V_\mathrm{real} = V_\mathrm{ideal} + nb,$$
but we know ...
- 15
1
vote
1
answer
136
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Error in finding Percent dissociation in an Equilibrium problem
I had issues solving the answer for this problem:
$\ce{PCl5}$ is $10\%$ dissociated at $\pu{1 atm}$. What is $\%$ dissociation at $\pu{4 atm}$?
$$\ce{PCl5 (g) <=> PCl3 (g) + Cl2(g)}$$
I ...
1
vote
4
answers
218
views
Error in calculating the composition of Al in an Al+Mg alloy in a problem
I had issues comparing my answer with that given in the textbook for this question:
$\pu{2g}$ of alloy of $\ce{Al}$ and $\ce{Mg}$ heated with excess $\ce{HCl}$ liberates $\ce{H2}$. The gas collected ...
- 33
0
votes
1
answer
39
views
Does the combined gas law work for two different gases?
We know that
$$\frac{P_\text{A}V_\text{A}}{n_\text{A}T_\text{A}}=\frac{P_\text{B}V_\text{B}}{n_\text{B}T_\text{B}}$$
We normally assume that this law corresponds to different conditions for the same ...
- 33
1
vote
1
answer
111
views
Why is this gas giving significantly incorrect values using Ideal Gas Law
Consider the refrigerant datasheet (R435B datasheet) for $R-435b$ at $\pu{25 ^\circ C}$ ($\pu{298.15 K}$):
Molar mass: $\pu{62.6 g mol-1}$
Saturation Vapor Density: $\pu{50.72 kg m-3}$
Saturation ...
- 265
0
votes
1
answer
72
views
When is the activity of a gas given by its' partial pressure?
The activity of an ideal gas in a reaction is given by its partial pressure. At the same time, all sufficiently dilute gases are ideal.
Let us consider the scenario:
I have a pressurized container of ...
- 121
0
votes
1
answer
166
views
Enthalpy in isochoric process
Let's consider a constant volume heating process of a gas. The heat $Q$ is added to the system and raises the temperature and pressure of the gas.
There is no work done by the gas since volume is kept ...
- 11
0
votes
1
answer
56
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How is van der Waals' constant b measure of repulsion
In van der Waals real gas equation, the constant 'b' determines the size of the molecules of gas ( excluded volume ), then I am not able to understand, how exactly it is a measure of repulsion?
- 136