a) M + 2HCl --> MCl2 +H2 (1)
MCO3 + 2HCl --> MCl2 + CO2 + H2O (2)
hh A gồm 2 khí là H2, CO2
MA=23(g/mol)
nA=0,2(mol)
Gọi \(\left\{{}\begin{matrix}nH2=x\left(mol\right)\\nCO2=y\left(mol\right)\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}x+y=0,2\\2x+44y=0,2.23=4,6\end{matrix}\right.=>\left\{{}\begin{matrix}x=0,1\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)
=> nM=nH2 =0,1(mol)
nMCO3=nCO2=0,1(mol)
=> 0,1MM + 0,1 (MM +60 ) = 10,8
=> MM=24(g/mol)
=> M:Mg
b) %nH2=%nCO2=50(%)