`a)PTHH:`
`Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
`0,45` `0,9` `0,45` `0,45` `(mol)`
`n_[Fe]=[25,2]/56=0,45(mol)`
`b)V_[H_2]=0,45.22,4=10,08(l)`
`c)m_[FeCl_2]=0,45.127=57,15(g)`
`d)m_[HCl]=0,9.36,5=32,85(g)`
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