Question

Coreleaza formulele substantelor din coloana A cu masele moleculare relative din coloana B, argumentind prin calcule.
A(formulele) B(masa moleculara relativa)
__1.A12O3 a)85
__2.NaNO3 b)100
__3.CaCO3 c)98
__4.H2SO4 d)102
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Answer 1

MAl2O3=2AAl+3AO=2*27+3*16=102g/mol

MNaNO3=ANa+AN+3AO=23+14+3*16=85g/mol

MCaCO3=ACa+AC+3AO=40+12+3*16=100g/mol

MH2SO4=2AH+AS+4AO=2*1+32+4*16=98g/mol

d-1

a-2

b-3

c-4