4

Mole itself doesn't have a magnitude, but the value of mole does, in fact it is the magnitude. Any measurement has a magnitude (ie for the mass of 5 kg the magnitude will also be 5). I think you are confusing it with scalar measurements (ie forces) which also have a direction. For example 5 Newtons 'in that direction'. Mole is similar to a dozen (just a ...


2

I think this question is same as wondering as to why a certain cancer patient has a cancer in the kidney but not on the skin? Nobody knows. In the same way, rusting is a random process as well. It can start anywhere. This iron sheet is not ultrapure iron sheet of homogeneous nature. One can see a lot of spots in troughs and crests of this sheet. Secondly you ...


1

The dye has probably migrated a bit into your ball`s surface, so whatever (solvent) you try to get it out with again, it might take a while. Remember the classic school (chromatography) experiment: You draw a line with a felt pen on a piece of paper, 2 cm from the edge, and stick the paper into a glass filled only 1cm high with acetone. You can try to ...


1

Just as a note to anyone considering it as an antiseptic agent, it is toxic and probably absorbs through the skin. Any compound that causes a change in osmotic pressure within a pathogen may kill it through plasmolysis, depending on how much of the compound is soluble in water. There may be other mechanisms by which a hydrocarbon poisons pathogens like the ...


1

It is common practice to define the standard state of a gas when describing its thermodynamic properties. For instance, the free energy of an ideal gas can be defined relative to the free energy in its standard state (the gas at a partial pressure of 1 bar and at the same temperature), as $$G = G^\circ + RT\log\left( \frac{p}{p^\circ} \right)$$ where $p^\...


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