Question

4. Calculate the RMM of a solute when 200 g of is dissolved in a 250 g solution of water with a freezing point of -3 °C. (Kfp = 1.86 °C mol"! kg) 2480 248 4960 0.496 e) 496 5. Which one of the following statements concerning crystal structures is correct? a) The packing efficiency of the body-centred cubic unit cell of iron is 68%. b) The coordination number in a face-centred cubic unit cell of polonium is 8. c) The body-centred cubic unit cell of iron contains 1 atom per unit cell. d) The arrangement of layers in the cubic close-packed structure (hcp) is abababab. e) The packing efficiency of cobalt, which has hexagonal close-packed structure, is 68%.

Answer 1

ATiKtp -1 whae m: melally i: vant nolf tadry liel) Kit 3 = ST5OC-3) IXI66 Xm m 3 1-8 moles 1-6199 wteg selvent(Kg) moles = 1.6129 O. moles mass melou mars 0.4032 1 0.4032 2009 molou mass 496 16 g1met molar mas