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Johnathon
Chemistry
17 December, 13:51
How many atoms are in 0.5 g Helium (He) ?
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Jeffrey Kerr
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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