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 = 6.022×102323×100number 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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