When gold crystallizes, it forms face-centred cubic cell. The uni… - Vidyadip

Question

When gold crystallizes, it forms face-centred cubic cell. The unit cell edge length is 408 pm .
Calculate the density of gold. [Molar mass of gold $=197 g \ mole ^{-1}$ ]
Which flower is an example of self cleaning?
Write the monomer used for preparation of PVC.

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Answer

Given: $a=408 pm =4.08 \times 10^{-8} cm, M=197 g / mol , \ n=4$ atoms for fcc, $\rho=$ ?
Formula: $\quad \rho=\frac{M n}{a^3 \times N_A}$
$\begin{array}{ll}\therefore & \rho=\frac{197 \times 4}{\left(4.08 \times 10^{-8}\right)^3 \times 6.022 \times 10^{23}} \\ \therefore & \rho=19.27 \times 10^3 kg / m ^3\end{array}$
The lotus flower is an example of a self-cleaning flower.
Vinyl chloride monomer is used for preparation of PVC.

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