Атомная масса NaOH = 23+16+1=40
массовая доля(Na)= 23*1/40=0, 575 = 57,5%
1) 6P + 5KClO3 = 3P2O5 + 5KCl
2) 3CaO + 2H3PO4 = Ca3(PO4)2 + 3H2O
3) 8P + 10NO2 = 4P2O5 + 10NO↑
<span>4) 4HNO3 = 4NO2</span>↑<span> + 2H2O + O2</span>
<span>m<span> (<span>SO3<span>) = 32 г.
<span>Пусть <span>m<span>p<span>.в. Н2<span>S<span>O4<span> – х, тогда:<span> <span>m<span>p<span>-<span>pa<span>H2<span>SO4<span> = 100х/40 = 2,5 х
<span>200 = 2,5 х + 32 + <span>m<span> (<span>SO3<span>)прор.
<span>т (Н2О) в р-ре </span><span>H2<span>SO<span>4 </span>=<span>2,5 х – х = 1,5 х
<span>n<span> (<span>H2<span>O<span>) =<span>
<span>n<span> (<span>SO3<span>) =
<span>m<span> (<span>SO3<span>)прор. = 80г/моль * <span> = <span>г.
<span>200 = 2,5 х + 32 +<span> ; 27,5 х = 504 ; х = 18,3
<span>Следовательно: <span>m<span>p<span>-<span>pa<span>H2<span>SO4<span> = 45,8 г.
<span>m (SO3)<span>прор<span>. = 122,2<span>г<span>. m (SO3)<span>ост<span>. = 32 <span>г<span>. m (SO3)<span> = 154,2 г.
<span>Ответ: 154,2 г. и <span>45,8 г.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
А) Ba(OH)2+2HCl=BaCl2+2H2O
Ba(2+) + 2OH(-)+2H(+)+2Cl(-)=Ba(2+)+2Cl(-)+2H2O
2OH(-)+2H(+)=2H2O
б) Na2CO3+Ca(NO3)2=CaCO3↓+2NaNO3
2Na(+)+CO3(2-)+Ca(2+)+2NO3(-)=CaCO3↓+2Na(+)+2NO3(-)
CO3(2-)+Ca(2+)=CaCO3↓
в)Na2CO3+2HNO3=2NaNO3+CO2↑+H2O
2Na(+)+CO3(2-)+2H(+)+2NO3(-)=2Na(+)+2NO3(-)+CO2↑+H2O
CO3(2-)+2H(+)=CO2↑+H2O
г)Na2CO3+KOH≠
д)Fe(OH)3+3HNO3=Fe(NO3)3+3H2O
Fe(OH)3+3H(+)+3NO3(-)=Fe(3+)+3NO3(-)+3H2O
Fe(OH)3+3H(+)=Fe(3+)+3H2O
Fe + 2HCl -> FeCl2 + H2↑
FeCl2 + 2NaOH -> Fe(OH)2↓ + 2NaCl
4Fe(OH)2 + O2 + 2H2O -> 4Fe(OH)3↓
2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O
Fe2(SO4)3 +3MgCl2 -> 2FeCl3 + 3MgSO4↓
FeCl3 + 3AgNO3 -> Fe(NO3)3 + 3AgCl↓