1)
Các phản ứng xảy ra:
\(4K + {O_2}\xrightarrow{{{t^o}}}2{K_2}O\)
\({K_2}O + {H_2}O\xrightarrow{{}}2KOH\)
\(2KOH + {H_2}S{O_4}\xrightarrow{{}}{K_2}S{O_4} + 2{H_2}O\)
\({K_2}S{O_4} + BaC{l_2}\xrightarrow{{}}BaS{O_4} + 2KCl\)
2)
Phản ứng xảy ra:
\(N{a_2}C{O_3} + 2HCl\xrightarrow{{}}2NaCl + C{O_2} + {H_2}O\)
Ta có:
\({m_{N{a_2}C{O_3}}} = 100.21,2\% = 21,2{\text{ gam}}\)
\( \to {n_{N{a_2}C{O_3}}} = \frac{{21,2}}{{23.2 + 60}} = 0,2{\text{ mol = }}{{\text{n}}_{C{O_2}}}\)
\( \to V = {V_{C{O_2}}} = 0,2.22,4 = 4,48{\text{ lít}}\)
