Question

The number of atoms in 8 g of sodium is \(x \times 10 ^{23}\). The value of x is                         . (Nearest integer)

[Given : \(N_{A} = 6.02\times 10^{23} \mathrm{mol^{-1}} \)

Atomic mass of Na = 23.0 u]

Answer 1

Ankur Tiwari, hello

1 mol of Na or 23 g of Na has 6.02×10²³ atoms.
8 g of Na has: 
⁸/₂₃ × 6.02×10²³ atoms
⇒2.09×10²³ atoms
≈2×10²³ atoms
The value of x is: 2

Please let me know if this helps