What is the mass in grams of 1.204 x 10^24 atoms of carbon?
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From Avogadro's hypothesis, we understand that 1mole of a substance contains 6.02x10^23 atoms.
From the above, it is evident that 1mole of Pb will also contain 6.02x10^23 atoms.
1mole of Pb = 207g/mol
207g of Pb contains 6.02x10^23 atoms.
Therefore, Xg of Pb will contain 1.2044 x 10^24 atoms i.e
Xg of Pb = (207x1.2044x10^24)/6.02x10^23 = 414.14g