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Question 2

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)?

Answer

Atomic mass of sodium = 23 u

Gram atomic mass of sodium = 23 g 

1 mole or 23 g of sodium has = 6.022 x 1023 atom

100 g of sodium has = 6.022x1023 / 23 x 100

       = 2.618 x 1024 atom

Atomic mass of Ison (fe) = 56 u

Gram atomic mass of fe = 56 g

1 mole of fe has = 6.022 x 1023 atom

56 g of fe = 6.022 x 1023 atom

100 g of fe = 6.022 x 1023 / 56 x 100

      = 1.075 x 1024 atom

Hence, 100 gram of Na has more number of atoms than 100 gram of fe.

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