The unit of time is :
(a) light year (b) parsec
(c) leap year (d) angstrom.
Lithium borohydride crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are a = 6.8 Angstrom , b = 4.4 A and c = 7.2 angstrom . If the molar mass is 21. 76g , calculate density of Crystal