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3 December, 22:01

What is the total number of molecules in a 0.5-mole sample of the He gas?

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  1. 4 December, 01:35
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    Avogadro’s constant tells us the number of atoms in a mole of any substance: 6.022x10^23. A mole of water, oxygen, sodium - they all have this many atoms in a 1 mole sample.

    A 0.5 mole sample of helium gas would contain 0.5 x (6.022 x 10^23) atoms, or 3.011 x 10^23 atoms. Still a big amount.
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