Q. The number of atoms in 4.6 g of sodium (Na = 23 u) is closest to:
4.6 ग्राम सोडियम (Na = 23 u) में परमाणुओं की संख्या निकटतम है:
Explanation
Given: 4.6 g sodium, atomic mass = 23 u
Steps:
- Moles of Na = 4.6 g ÷ 23 g/mol = 0.2 mol
- Number of atoms = 0.2 mol × 6.022 × 10²³ atoms/mol
- Number of atoms = 1.204 × 10²³ ≈ 1.2 × 10²³
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