Question

5 moli de Cu SO4=? grame 240 g H2 Co3=? moli​

Answer 1

Răspuns:

n = m / M

m = n × M

n = nr de moli

M = masa molara

m = masa  

M  ≈ 160 g/mol  

m = 5 × 160  

m = 800 g

M (H2CO3) = 2 x 1 + 1 x 12 + 3 x 16 = 2 + 12 + 48 = 62 g/mol  

1 mol H2CO3 .........  62g H2CO3

x moli H2CO3 ........ 240 g H2CO3

x = 240 : 62 = 3,87 moli H2CO3