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Which has more number of atoms 100 g of ...

Which has more number of atoms 100 g of sodium or 100 g of iron? Justify your answer. Atomic mass of sodium =23 u, atomic mass of iron= 56 u)

Text Solution

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100 g of sodium has more number of atoms than 100 g of iron.
Justification:
1) Atomic mass of sodium= 23 u
23 g of sodium contains `6.022 times 10^23` atoms.
100 g of sodium contains `=100/23 times 6.022 times 10^23`
`26.1826 times 10^23` atoms of sodium.
2) Atomic mass of iron= 56 u
`therefore` 56 g of iron contains `6.022 times 10^23` atoms
100 g of iron contains `6.022 times 10^23` atoms
100 g of iron contains =`100/56 times 6.022 times 10^23`
=`10.7535 times 10^23` atoms of iron.
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