R+2HCl---->RCl2+H2
Ta có
n\(_{H2}=\frac{5,6}{22,4}\)=0,25(mol)
Theo pthh
n\(_R=n_{H2}=0,25\left(mol\right)\)
M\(_R=\)\(\frac{6,082}{0,25}=24\)
=> R là Mg(Magie)
nH2 = 0,25 (mol)
PTHH : R+ 2HCl---> RCl2+ H2
=>> nR = 0,25 (mol)
=> M R = 24(MG)