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Chemistry · PYQ NEET UG 2022
हिन्दीCopper crystallises in fcc unit cell with cell edge length of \( 3.608 \times 10^{-8}\text{ cm} \). The density of copper is \( 8.92\text{ g cm}^{-3} \). Calculate the atomic mass of copper.
Correct answer · Option 1
\( 63.5\text{ g mol}^{-1} \)
Explanation
Using \( d = \frac{Z \cdot M}{a^3 \cdot N_A} \), \( M = \frac{8.92 \times (3.608 \times 10^{-8})^3 \times 6.022 \times 10^{23}}{4} \approx 63.5\text{ g mol}^{-1} \).
