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17 December, 13:51

How many atoms are in 0.5 g Helium (He) ?

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  1. 17 December, 13:55
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    Well first you need to know the molar mass of He which is 4.0026g/mol and Avogadro's number which is 6.022*10^23 (units). So the equation is

    0.5gHe * mol/4.0026He * (6.022*10^23) He atoms/mol

    =7.5*10^22 He atoms

    Round to only one sig fig because 0.5g only has one

    Final answer: 8*10^22 He atoms
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