Question

Masa atomica a elementelor:
NaCl;H2CO2;NaNO2;H2SO4;K2SO4;HNO3;Na2SO4;AgNO3;K2CO3;HCl;FeS2

Answer 1

Ar(NaCl) = Ar(Na) + Ar(Cl) = 23 + 35,5 = 58,5;
Ar(H₂CO₃) = Ar(2*H) + Ar(C) + Ar(3*O) = 2 * 1 + 12 + 3 * 16 = 62;
Ar(NaNO₂) = Ar(Na) + Ar(N) + Ar(2*O) = 23 + 14 + 2*16 = 59;
Ar(H₂SO₄) = Ar(2*H) + Ar(S) + Ar(4*O) = 2*1 + 32 + 4*16 = 98;
Ar(K₂SO₄) = Ar(2*K) + Ar(S) + Ar(4*O) = 2*39 + 32 + 4*16 = 174;
Ar(HNO₃) = Ar(H) + Ar(N) + Ar(3*O) = 1 + 14 + 3*16 = 63;
Ar(Na₂SO₄) = Ar(2*Na) + Ar(S) + Ar(4*O) = 2*23 + 32 + 4*16 = 142;
Ar(AgNO₃) = Ar(Ag) + Ar(N) + Ar(3*O) = 170;
Ar(K₂CO₃) = Ar(2*K) + Ar(C) + Ar(3*O) = 2*39 + 12 + 3*16 = 138;
Ar(HCl) = Ar(H) + Ar(Cl) = 1 + 35,5 = 36,5;
Ar(FeS₂) = Ar(Fe) + Ar(2*S) = 56 + 2*32 = 120.