6.
1) 2Li + S = Li₂S
2) 4B + 3O₂ = 2B₂O₃
3) 2Na + I₂ = 2NaI
4) N₂ + 3H₂ = 2NH3
7.
W(E) = M(E)/M(вещ-ва)
W(O) в Na₂O > W(0) в СuO
W(O) в Na₂O : 16/62 * 100% = 26%
W(0) в СuO : 16/80 * 100% = 20%
6.
1) 2Li + S = Li₂S
2) 4B + 3O₂ = 2B₂O₃
3) 2Na + I₂ = 2NaI
4) N₂ + 3H₂ = 2NH3
7.
W(E) = M(E)/M(вещ-ва)
W(O) в Na₂O > W(0) в СuO
W(O) в Na₂O : 16/62 * 100% = 26%
W(0) в СuO : 16/80 * 100% = 20%