\(a.\) magnesium+chloric acid→magnesium+hydrogen
\(b.m_{Mg}+m_{HCl}=m_{MgCl_2}+m_{H_2}\)
\(c,\left(b\right)\Leftrightarrow2,4+7,2=9,5+m_{H_2}\\ \Leftrightarrow m_{H_2}=0,1g\)
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