Question

how do we calculate the gram molecular weight of a gas​

Answer 1

The exact number is known as Avogadro's Number, and is 6.22140857x1023 atoms. Moles relate the number of atoms in a sample to itsmass in grams using molar mass, which tells us the mass of one mole of atoms in a sample. We can find themolar mass of a gas using the idealgas law.

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