$\begin{array}{1 1}(a)\;4.3\times 10^{-23}cm^3&(b)\;0.67cm^3\\(c)\;0.17\times 10^{23}cm^3&(d)\;2.88\times 10^{-22}cm^3\end{array}$

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Mass =Volume $\times$ Density

$260=Volume\times 1.5$

$\therefore$Volume of N molecules =$\large\frac{260}{1.5}$

Where $N=6.023\times 10^{23}$ molecules

$\therefore$Volume of 1 molecule=$\large\frac{260}{1.5\times 6.023\times 10^{23}}$

$\Rightarrow 2.88\times 10^{-22}$

Hence (d) is the correct answer.

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