Question

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3) Niobium (Nb) is a metal that crystalizes with cubic unit cell that is body-centered 3) (BCC). Nb has an atomic radius of 143 pm. What is its density in g/cm? A) 9.33 g/cm 4 7.432 B) 8.57 g/cm3 C) 17.1 g/cm3 043248x10 9 THB D) 4.28 g/cm3 E) 52.8 g/cm3 4) 4) An aqueous solution has a mole fraction of solute of 0.0385. What is the molality of this solution? A) 0.0860 m B) 2.054 m C) 55.50 m D) 2.137 m E) 2.222 m

Answer 1

3) Ni Croitos into boy centred Cubic Bec) namic madiw = 31: 147 pm 143 10 cm : 1.43x10cm Fan CC cl-eetge of unit eu du diagonale face of une cu 4/1 berly dlagthai The considered triangle wit 3 5 oregled targe. - Theute qythagora: fwrxem can be applied. det (3) -14%) 34. 162 1902 d. edge of cel mai d. 3.3024X10CM Volu unic (211 dº : (3.302** ***m) 26.015570 CM 3.ES Y - man of the present in GC urit ceu aume mes of Nigba 99.90028 92.906 1 -1.5435 14-g latu. 6-023103 com el 1.5625x10 "glaron x 2 3.065* -> Deruil : met wolume. 3.COIS 110 de cm 8.5658 glone {cplion ? male fractich of Selute - C.C385 muality of selation ! moles of B YE mole fractice of selecte. ZG Total rio.meles.T khaleerling silverte #5 | H |- Le mass of solent moles Malos mand A. : mops * Me = (1-36 (MA) Moralin (m): mcle: daclule mam solent in kg 73X100D (-13) (MA) Subsituring C: & since it is a Lou stechion) propsicle Vaud 00355 X ICOD (1-0-C365) x 1 _32-5 17.307 2294 miling