... = 6,02 * 102 3 ) - Khi lng riờng: : D= M V ' dd = M Vdd ( vc / cm3 ) - vc = 1,67 * 10- 24 - nm = 10- 9m = 10 - = 10- 10 m = 10 -8 Cõu 1: Tớnh lng riờng ca nguyờn t a) Zn, bit rZn = 1,35 .10- 8 cm, ... trng ) A 1,97 10- 8 cm3 B 4,74 10- 8 cm3 C 4,78 10- 8 cm3 D 7,48 10- 8 cm3 Hng Dn 3V - p dng CT: V = R (R l bỏn kớnh nguyờn t ) R = Thay s R = 25,87.74 = 1,97 .108 cm3 23 100 6, 02 .10 - Th tớch ... * 1,67 * 10- 24 Khi lng nguyờn t tng i = NA * Khi lng tuyt i ( NA = 6,02 * 102 3 ) Cõu 1: Bit lng nguyờn t mNa = 38,1634 .10- 27kg; mS = 53,226 .10- 27kg; mMg = 40,358 10- 27kg; mP = 51,417 10- 27kg Tớnh...