Răspuns:
a. MgO
b. r.a. Mg:O= 1 : 1
c. M= A,Mg + A,O= 24+16=40 g/mol
d. ?
e. 1kmol= 1000mol
f. r.m. Mg;O= 24;16
=3 : 2
h. niu=m/M=240/24mol=10mol
i.1mol........6,023x10²³atomi Mg ,......6,023x10²³atomi O
10mol...............x...................................y
x=y=60,023x10²³ at
j. 40gMgO...........16gO
240g......................x
x=m=96gO
Explicație: