Question

1,8x10^23 moléculas de uma substancia A têm massa igual a 18,0g.A massa molar de A,em g/mol,vale?

R: 1,8x 10^23 ---- 18g   
      6,02 x 10^23 ------  x
         x= 60,2

Answer 1

6*10²³-----18g
1,8*10²³-----x

x=18*1,8.10²³/6*10²³
x=32,4*10²³/6*10²³   (Corta o Avogadro 10²³) Resta 5,4
x=5,4

Answer 2

1,8×10^23=1,8^23=18g
6,02x10^23=6,02^23
60,2^23
=5