1. Tardigrade
  2. Question
  3. Chemistry
  4. In orthorhombic unit cell the value of a , b and c are respectively 4.2 mathringA, 8.6 mathringA and 8.3 mathringA. Given the molecular mass of the solute is 155 g mol -1 and density is 3.3 g / cc, the number of formula units per unit cell is (Report your answer by rounding up to nearest integer)

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. In orthorhombic unit cell the value of $a , b$ and $c$ are respectively $4.2\, \mathring{A}, 8.6\, \mathring{A}$ and $8.3\, \mathring{A}$. Given the molecular mass of the solute is $155\, g\, mol ^{-1}$ and density is $3.3\, g / cc$, the number of formula units per unit cell is (Report your answer by rounding up to nearest integer)

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

$Z =\frac{ V \times N _{ A } \times \rho}{ M }$
$V=$ Volume of unit cell $=a \times b \times c$
$=\frac{4.2 \times 8.6 \times 8.3 \times 10^{-24} \times 6.023 \times 10^{23} \times 3.3}{155}=3.84 \sim e q 4$