1)
\(NaHS{O_4}\) -muối axit : natri hidrosunfat
\({H_2}S{O_4}\) - axit : axit sunfuric
\({P_2}{O_5}\) - oxit axit : diphotpho pentaoxit
\(Fe{(OH)_3}\) - oxit bazo: sắt (III) hidroxit
2)
a) \(3Fe + 2{O_2}\xrightarrow{{{t^o}}}F{e_3}{O_4}\)
Phản ứng cháy (hóa hợp)
b) \(4Al + 3{O_2}\xrightarrow{{{t^o}}}2A{l_2}{O_3}\)
Phản ứng cháy (hóa hợp)
c) \(2F{e_x}{O_y} + \frac{{3x - 2y}}{2}{O_2}\xrightarrow{{{t^o}}}xF{e_2}{O_3}\)
Phản ứng cháy ( hóa hợp)
d) \(2KMn{O_4}\xrightarrow{{{t^o}}}{K_2}Mn{O_4} + Mn{O_2} + {O_2}\)
Phản ứng phân hủy
3)
BTKL: \({m_{dd}} = {m_{Ba{{(OH)}_2}}} + {m_{{H_2}O}} = 34,2 + 165,8 = 200{\text{ gam}} \to {\text{C}}{{\text{\% }}_{Ba{{(OH)}_2}}} = \frac{{34,2}}{{200}} = 17,1\% \)
4)
Phản ứng xảy ra:
\(Mg + 2HCl\xrightarrow{{}}MgC{l_2} + {H_2}\)
Ta có:
\({n_{Mg}} = \frac{{3,6}}{{24}} = 0,15{\text{ mol = }}{{\text{n}}_{{H_2}}} \to {V_{{H_2}}} = 0,15.22,4 = 3,36{\text{ lít}}\)
\({n_{HCl}} = 2{n_{Mg}} = 0,3{\text{ mol}} \to {{\text{V}}_{HCl}} = {V_{dd}} = \frac{{0,3}}{1} = 0,3{\text{ lít}}\)
\({n_{MgC{l_2}}} = {n_{Mg}} = 0,15{\text{ mol}} \to {{\text{C}}_{M{\text{ MgC}}{{\text{l}}_2}}} = \frac{{0,15}}{{0,3}} = 0,5M\)
