Question

calculează nr de moli de oxid ce se obțin prin arderea a 12 g magneziu masa magneziu 24vmasa oxigen 16​

Answer 1

Răspuns:

12g X

2Mg + O2=2MgO

2•24g/mol 2•40g/mol

12g / 2•24g/mol = X / 2•40g/mol

X=12•2•40mol / 2•24g/mol = 20 g MgO

n=m/M

n=20g/40g/mol=0,5mol MgO