\(m_A=n.m_A\)
\(\Rightarrow n_A=\frac{V}{22,4}=\frac{5,6}{22,4}=0,25\) (mol)
\(\Rightarrow M_A=dAH_2.MH_2=17.2=34\) (g)
\(\Rightarrow m_A=n.M_A=0,25.34=8,5g\)
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