[" How many unit cells are present in a cube shaped ideal crystal of "NaCl" of mass "1.00g" ? "],[[" [Atomic mass: "Na=23,Cl=35.5],],[" (1) "5.14times10^(21)," (2) "1.28times10^(21)," (3) "1.71times10^(21)," (4) "2.57times10^(21)]]