ПОМОГИТЕ, ПОЖАЛУЙСТА! СРОЧНО! Уравняйте уравнения: O2+K →; Br2+Ca →; Cl2+H2 →; Cl2+Zn →; N2+Na →; Cl2+Ca →; Si+O2 →(2 сл); Cl2+O2 →(4сл); Se+O2 (2 сл)
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