A crystalline polymer molecule is uniform prismatic in shape with dimensions as shown. If density of this polymer is $1.2 g / {cm}^{3}$ . Find its molar mass.

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Insufficient data

$939 \times 10^{3}$

$632 \times 10^{3}$

$939 \times 10^{- 3}$

answer is A.

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Detailed Solution

molar mass = volume $\times$ density

$= \frac{\sqrt{3}}{2} \times {(100 \times 10^{- 10})}^{2} \times 6.23 \times 10^{23} \times 12$

$\begin{array}{l} = \frac{\sqrt{3}}{4} {(100 \times 10^{- 10})}^{2} \times 6.23 \times 10^{23} \times 1.2 \times 10^{16} \\ = 939 \times 10^{3} \end{array}$

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