Răspuns:
1.
MH2=2x1=2g/mol
MHF=1+19=20g/mol
2g..............2x20g
H2 + F2 → 2HF
45g................xg
x=45x2x20/2=calculeaza
2.
100gCa..............35gCa pur
45g Ca..................yg Ca pur
y=45x35/100=15,75gCa pur
MCa=40g/mol
MCaO=40+16=56g/mol
2x40g............2x56g
2Ca + O2 → 2CaO
15,75g..............zg
z=15,75x2x56/2x40=calculeaza
Explicație:
