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If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon?
One mole of carbon atoms weighs 12 g (Given)
i.e., mass of 1 mole of carbon atoms = 12 g
Then, mass of 
number of carbon atoms = 12 g
Therefore, mass of 1 atom of carbon 
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
Atomic mass of Na = 23 u (Given)
Then, gram atomic mass of Na = 23 g
Now, 23 g of Na contains = 
number of atoms
Thus, 100 g of Na contains 
number of atoms
= 
number of atoms
Again, atomic mass of Fe = 56 u(Given)
Then, gram atomic mass of Fe = 56 g
Now, 56 g of Fe contains = number of atoms
Thus, 100 g of Fe contains 
number of atoms
number of atoms
Therefore, 100 grams of sodium contain more number of atoms than 100 grams of iron.
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