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The periodic table provides information about each element that serves somewhat the...

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christiano-cr7 | Salutatorian

Posted June 21, 2013 at 2:00 AM via web

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The periodic table provides information about each element that serves somewhat the same purpose as the label on the nail bin described in Part 1, only in this case, the mass (molar mass) of each element is the number of grams of the element that contain 6.02 × 1023 atoms or molecules of the element. As you are aware, the quantity 6.02 × 1023 

a. If you had 0.15 kg of helium, how many helium atoms would you have?

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted June 21, 2013 at 2:25 AM (Answer #1)

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Molar mass of helium = 4g/mol

Amount of moles in 0.15kg He `= (0.15*1000)/4 = 37.5 mol`

Amount of atoms per 1 mole =` 6.022xx10^23`

 

Amount of atoms in 37.5 moles `= 37.5xx6.022xx10^23 = 2.26xx10^25`

 

So in 0.15Kg of He we would have `2.26xx10^25` atoms.

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