Массовая доля фосфора равна 62/142*100%=43.66%
3) 43,7%
Na2O+CO2=Na2CO3
Na2CO3+ H2O + CO2 = <em>Na2CO3</em> + H2SiO
Na2CO3 + 2HCI=H2CO3+2NaC
Na2S + 2HCl = 2NaCl + H2S
4FeO + O2 = 2Fe2O3
<span>(NH</span>4<span>)</span>2<span>SO</span>4<span> + 2KOH -> K</span>2<span>SO</span>4<span> + 2NH</span>3<span> + 2H</span>2<span>O</span>
<span>2NH</span>4+<span> + SO</span>42-<span> + 2K</span>+<span> + 2OH</span>-<span> -> 2K</span>+<span> + SO</span>42-<span> + 2NH</span>3<span> + 2H</span>2<span>O</span>
<span>2NH</span>4+<span> + 2OH</span>-<span> -> 2NH</span>3<span> + 2H</span>2<span>O</span>
<span>NH</span>4+<span> + OH</span>-<span> -> NH</span>3<span> + H</span>2<span>O</span>
Ответ:
дано
m (ppaAgNO3) = 170 g
W(AgNO3) = 20%
+HCL
-----------------------
m(AgNO3) = 170 * 20% / 100% = 34 g
AgNO3+HCL-->AgCL↓+HNO3
M(AgNO3) = 170 g
n(AgNO3) = m/M = 34 / 170 = 0.2 mol
n(AgNO3) = n(AgCL) = 0.2 mol
M(AgCL) = 143.5 g/mol
m(AgCL) = n*M = 0.2 * 143.5 = 28.7 g
ответ 28.7 г
Объяснение: