Question
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)? [3 MARKS]
Answer:
:
Each point: 1.5 Marks
1. Atomic mass of Na = 23 u (Given)
Then, gram atomic mass of Na = 23 g
Now, 23 g of Na contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Na contains = 6.022×102323×100 number of atoms
= 2.6182 x 1024 number of atoms.
2. Again, atomic mass of Fe = 56 u (Given)
Then, gram atomic mass of Fe = 56 g
Now, 56 g of Fe contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Fe contains =6.022×102356×100 number of atoms
= 1.0753 x 1024 number of atoms.
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:
Each point: 1.5 Marks
1. Atomic mass of Na = 23 u (Given)
Then, gram atomic mass of Na = 23 g
Now, 23 g of Na contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Na contains = 6.022×102323×100 number of atoms
= 2.6182 x 1024 number of atoms.
2. Again, atomic mass of Fe = 56 u (Given)
Then, gram atomic mass of Fe = 56 g
Now, 56 g of Fe contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Fe contains =6.022×102356×100 number of atoms
= 1.0753 x 1024 number of atoms.
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