Question

determine a massa em gramas de
a) 6,0x10^25 átomos de he (he=4g)
b) 3,0x10^22 átomos de ne (ne=20g)

Answer 1

6,0x10^25 átomos de he ------- 4g de He
1 atomo de He---------------------- x
(6,0x10^25 )x= 4
x=  1,5 . 10 ^-25