a) Giả sử k.m1 = m2
m1 chứa \(\left\{{}\begin{matrix}Na:a\left(mol\right)\\Ca:b\left(mol\right)\end{matrix}\right.\)
=> m2 chứa \(\left\{{}\begin{matrix}Na:ak\left(mol\right)\\Ca:bk\left(mol\right)\end{matrix}\right.\)
PTHH: 2Na + 2HCl --> 2NaCl + H2
a--------------------->0,5a
Ca + 2HCl --> CaCl2 + H2
b------------------------>b
2Na + 2H2O --> 2NaOH + H2
ak--->ak
Ca + 2H2O --> Ca(OH)2 + H2
bk->2bk
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
=> 0,5a + b = 0,15
=> a + 2b = 0,3
\(n_{H_2O}=\dfrac{10,8}{18}=0,6\left(mol\right)\)
=> ak + 2bk = 0,6
Xét \(\dfrac{a+2b}{ak+2bk}=\dfrac{0,3}{0,6}\)
=> k = 2
=> \(\dfrac{m_1}{m_2}=\dfrac{1}{2}\)
nHCl = 2.nH2 = 0,3 (mol)
=> \(V=\dfrac{0,3}{0,5}=0,6\left(l\right)\)
b)
PTHH: 2Na + 2HCl --> 2NaCl + H2
ak--->ak
Ca + 2HCl --> CaCl2 + H2
bk->2bk
=> nHCl = ak + 2bk = 0,6 (mol)
=> \(C_{M\left(dd.HCl\right)}=\dfrac{0,6}{0,6}=1M\)