What is the coordination number of particle in simple cubic structure ?

Calculate the density of an element having molar mass $225\ \text{g mol}^{-1}$ forming bcc structure $[a^3 \times N_A = 75\ \text{cm}^3\text{mol}^{-1}]$

Calculate $\Delta T_b$ of a $0.45$ m solution of a nonvolatile solute in solvent if molal elevation constant of solvent is $3.0$ K kg mol$^{-1}$

Calculate the mass of nonvolatile solute dissolved in $0.3$ dm$^3$ water having osmotic pressure $0.1$ atm at $300$K.
[Molar mass of solute = $328$ g mol$^{-1}$, R = $0.082$ dm$^3$atm K$^{-1}$mol$^{-1}$]