Question

va rog e urgent primesc nota ​

Answer 1

Răspuns:

calculez masa de Mg pur din 30g Mg impur,de puritate 96%

p=m,px100/m,i---> m,p= 30x96/100g= 28,8g

calculez moli Mg, stiind A,Mg-=24g/mol

niu= m/A= 28,8/24mol= 1,2molMg

-calculez moli si masa oxid de magneziu din ecuatia chimica

2mol..........................2mol

2Mg + O2---> 2MgO

1,2mol....................s

x= niu=1,2molMgO

miuMgO= 40g/mol

m= niuxmiu=1,2x40g=48gMgO

Explicație: