Question

orice priceput la chimie sa ma ajute!!!!​

Answer 1

Răspuns:

-calculez masa de Mg pur

p=m,purx100/m,inpur----> m,p= 8x80/100g= 6,4gMg pur

A,Mg= 24g/mol

M,MgO= (24+16)g/mol= 40g/mol

-din ecuatai chimica , deduc masa de oxid de magneziu

2x24g........................2x40g

2Mg    +   O2-----> 2MgO

6,4g.............................x

x=m=6,4x40/24g=10,66gMgO