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Why was Avogadro’s numbers chosen to be the value that it is?

I understand that the mole is an extremely useful way of measuring and understanding atomic quantities. However, I can not find anywhere on the web why is it, that Avogadro’s number was chosen as $6.022*10^{23}$. I also understand that it is not necesary to know the history of the number in order to apply it. […]

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Why does changing the pressure not affect the yield of hydrogen at equilibrium?

I have an equation for a reaction to produce hydrogen: CO(g) + H₂0(g) <=> CO₂(g) + H₂(g) Could you help me to understand why changing the pressure does not affect the yield of the hydrogen at equilibrium Also, why is the best yield of the hydrogen at equilibrium obtained at low temperatures? Thanks in advance

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What does the value of the pH meter mean when there aren’t any hydronium ions in the substance being tested?

What does the value of the pH meter mean when there aren’t any hydronium ions in the substance being tested? How does the pH meter show a value which fluctuates as non-aqueous solvents are being tested? I thought that the pH meter only measured hydronium ions. Is there any way that this value actually means […]

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In free radical substitution of propane with halogens, how do you know which carbon ends up with an unpaired electron after fission of C-H bond?

In free radical substitution of propane with a halogen (eg- chlorine), how do you know which carbon out of the three ends up with an unpaired electron after fission of C-H bond? This image shows methane, so there is only one possibility since there is only one carbon, but what about alkanes like propane with […]

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What kind of reaction is this? Hydrated copper sulphate [+heat energy] anhydrous copper sulphate + water [closed]

I’m quite new to chemistry and just need to know what type of reaction this is. hydrated copper sulphate [+heat energy] <=> anhydrous copper sulphate + water

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How to create black precipitate in clear liquid

I am not a chemistry person at all, so my apologies if my question seems dumb. I am working on the set for a short film and in one of the scenes we would like the main actor to look at a sample of water, drop something into it and watch a black precipitate form. […]

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Question on Kinetic theory of gases

The amount of heat energy requires to raise the temperature of 1 g of helium at NTP from T1 kelvin to T2 kelvin is ? I have a confusion as the gas is at NTP therefore it is an isochoric process as well as isometric proc

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Difference in chemical composition between black, white and green bin bags

I notice that generally speaking black bin refuse sacks have a very strong smell. White bin liners have a similar smell though much lighter smell. Green bags which I believe are refereed to as garden sacks again have a similar smell but not as strong as black bin liners. I find the black bin liners […]

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What would be the aldol condensation products in B

In this question (13) I figured out A,C were wrong and D would be correct choice but I am stuck at finding out products formed in B and also why it would be wrong? Please help.

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Photos: imported AVI file from old camera has wrong date taken (day of import), but all metadata seems to be correct

I’m trying to import all my photo library to Photos.app. I have several videos, which were taken in 2007 in AVI format on old digital camera. And that videos after imported appears in Photos.app like it was taken today (date of import). All metadata seems to be correct This is output of GetFileInfo: type: “\0\0\0\0” […]