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**Chemistry / Re: Why Mass <> moles<> no of molecules are interconverted?**

« **on:**24/04/2018 11:31:08 »

Equation #2 describes the following reaction (molecule by molecule):

CH

Equations #1 (mole by mole), #3 (liter by liter) & #4 (gram by gram) are just ways of expressing the following reaction (where N

N

#1: Avogadro's number of molecules = 1 mole (regardless of whether is is solid, liquid or gas)

#3: Avogadro's number of molecules of an ideal gas takes up 22.4 liters at standard temperature & pressure

#4: Avogadro's number of molecules has a mass in grams which is equal to the atomic mass in grams (regardless of whether is is solid, liquid or gas)

These are some interlinked definitions.

#4 is the definition, which determines the value of N

#3 is a measurement, which can be extrapolated to other temperatures and pressures (provided the pressure doesn't get too high, or the temperature get low enough for the gas to start condensing into a liquid).

These are all ways of expressing Proust's Law, which dates from 1779:

https://en.wikipedia.org/wiki/Law_of_definite_proportions

CH

_{4}(g) + 2O_{2}(g) = CO_{2}(g) + 2H_{2}O (g)Equations #1 (mole by mole), #3 (liter by liter) & #4 (gram by gram) are just ways of expressing the following reaction (where N

_{A}is Avogadro's constant):N

_{A}CH_{4}(g) + 2N_{A}O_{2}(g) = N_{A}CO_{2}(g) + 2N_{A}H_{2}O (g)#1: Avogadro's number of molecules = 1 mole (regardless of whether is is solid, liquid or gas)

#3: Avogadro's number of molecules of an ideal gas takes up 22.4 liters at standard temperature & pressure

#4: Avogadro's number of molecules has a mass in grams which is equal to the atomic mass in grams (regardless of whether is is solid, liquid or gas)

These are some interlinked definitions.

#4 is the definition, which determines the value of N

_{A}#3 is a measurement, which can be extrapolated to other temperatures and pressures (provided the pressure doesn't get too high, or the temperature get low enough for the gas to start condensing into a liquid).

These are all ways of expressing Proust's Law, which dates from 1779:

https://en.wikipedia.org/wiki/Law_of_definite_proportions

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