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Home Q & A Board Biology-Related Homework Help General Biology
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bcretired bcretired
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11 years ago
If 2.01 × 1023 atoms of an element from Group IIA of the periodic table has a mass of 29.3 grams, this element is most likely
 A. Sr  
 
 B. Mg  
 
 C. Ca  
 
 D. Na  
 
 E. Ba  
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wrote...
#1
11 years ago
MASS g of unknown atom x (?) x (6.02 x 10^23 atoms/ 1 mol) = 2.01 × 1023 atoms

Now solve for (?).

(2.01 × 1023 atoms) / (29.3 x 6.02 x 10^23 atoms) =
wrote...
#2
11 years ago
avogadro's number 6.02 x 10^23 atoms per mole of an element, each element then has a certain amount of grams per mole, allowing for a mass to atom or atom to mass conversion.
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#3
11 years ago
Mass -> atoms

Mass (g) / Atomic mass of element (g/mol) * N (atoms/mol)

g * (g/mol) * (6.022x10^23 atoms/mol) = atoms
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#4
11 years ago
i thought chemestry was about blowingstuff up
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#5
Staff Member
11 years ago
Quote from: Th3Br41n5 (11 years ago)
i thought chemestry was about blowingstuff up

That too. Wink Face
- Master of Science in Biology
- Bachelor of Science
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