An element with density 2.8g/cm³ forms a fcc unit cell edge length 4×10^-8
Answers
Answered by
2
Answer: Molar mass is 27g mol^-1
Explanation:
Density (D) = 2.8g cm^-3
Unit cell f.c.c.(Z) = 4
Edge length (a) = 4✖️10^-8 cm
Avogadro’s number (NA) = 6.022✖️10^23 mol^-1
Molar mass (M) = ?
=> D = Z✖️M / NA ✖️ a^3
=> M = D✖️a^3✖️NA / Z
= 2.8g cm^-3(4✖️10^-8cm)^3✖️6.022✖️10^23 / 4
= 2.8✖️16✖️10^-1✖️6.022
.*. M = 26.98g mol^-1
= 27g mol^-1
Similar questions