The mass of one Avogadro number of helium atoms is?
...The mass of one Avogadro number of helium atoms is?
1.00gram
4.00gram
8.00gram
6.00gram
Correct answer is B
Avogadro's number is an absolute number: there are 6.022×1023 elementary entities in 1 mole.
helium has a molar mass of 4.0 grams per mole. So one mole of helium has a mass of 4.0 grams.
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