Molar mass of Li = 6.9 g/mol 6.9 g -------------------- 6.0x10²³ atoms      g -------------------- 2.75x10^21 atoms 6.0x10²³ g = 6.9 * (2.75x10^21) 6.0x10²³ g = 1.8975x10²² g = 1.8975x10²² / 6.0x10²³ x = 0,0317 g answer b hope this helps!.