Ответ:
Объяснение:
ₓ ₋₂
Mn2O7, 2x+7*(-2) = 0; 2x = 14; x = +7 Mn₂⁺⁷O₂⁻²
₊₁ ₓ ₋₂
H2SO4, (+1)*2 + x + 4*(-2) = 0; x = -2+8 = +6 H₂⁺¹S⁺⁶O₄⁻²
₊₁ ₓ
H₃N, (+1)*3 +x = 0; x=-3; H₃⁺¹N⁻³
₊₁ ₓ ₋₂
KMnO4, +1 +x + (-2)*4 = 0; x = -1+8 = +7 K⁺¹Mn⁺⁷O₄⁻²
₊₁ ₓ ₋₂
Na₃PO4, +1*3 + x + (-2)*4 = 0; x = -3+8 = +5 Na₃⁺¹P⁺⁵O₄⁻²
₊₂ ₓ ₋₂
Mg(NO3)₂, +2 + (x + (-2)*3)*2 = +2 + 2x -12; 2x = 12-2; 2x = +10; x = +5
Mg⁺²(N⁺⁵O₃⁻²)₂