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Which has more number of atoms, 100 grams of sodium or 100 gram of iron (given, atomic mass of Na - 23u, fe - 56u)?

Posted by Jaskirat Singh 3 years, 9 months ago

CBSE > Class 09 > Science

2 answers

Aman Shyoran 3 years, 9 months ago

Sodium

0Thank You

Gaurav Seth 3 years, 9 months ago

Given

Atomic mass of Na = 23 u

Atomic mass of Fe = 56 u

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 x 10²³ / (23 x 100 number of atoms)

100 g of Na contains = 2.6182 x 10²⁴ number of atoms

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 x 10²³ / (56 x 100 number of atoms)

100 g of Fe contains = 1.0753 x 10²⁴ number of atoms

Therefore, 100 grams of sodium contains more number of atoms than 100 grams of iron.

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