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Calculations with the unit cell of $NaCl$

A monocristal of NaCl has a mass of 410 g; Immersed in a beaker filled to the brim with petrol, it causes overflow of 190 cm3 liquid. Calculate (answers at the bottom):   - the molar mass of CsCl.   - the mass density of CsCl.   - the molar volume of CsCl.   - the number of cations (or anions) per unit cell.   - the number of unit cells per mole.   - the volume $V$ of one unit cell.   - the length of the edge $a$ of one unit cell.