3Zn+2H3PO4=Zn3(PO4)2+3H2
n(H2)=V/Vm=0,224/22,4=0,01 моль
n(Zn)=n(H2)=0,01 моль
m(Zn)=m*M=0,01*65=0,65 г
1 вариант решения
CuO + H2 → Cu + H2O
n(CuO) = m / M = 20 / 64+16 = 0.25 моль
n(CuO) = n(H2) = 0.25 моль
m(H2) = n * M = 0.25 * 2 = 0.5г
2 вариант решения
20 x
CuO + H2 → Cu + H2O
80 2
x = 2*20/80 = 0.5г
Они называются предельными алифатическими углеводородами или алканами.
2- H2SO4+2NaOH=Na2SO4+2H2O
3- CuSO4+2NaOH=Cu(OH)2+Na2SO4
5- 2HCl+Na2CO3=2NaCl+CO2+H2O
<span>1. 3NaOH + H</span>₃<span>PO</span>₄= Na₃PO₄ + 3H₂O
<span>
2.MgO +H</span>₂<span>SO</span>₄=MgSO₄ + H₂O
<span>
3.H</span>₂<span>SO</span>₄ + 2<span>NaOH = Na</span>₂SO₄ + 2H₂O
<span>
4.Al</span>₂<span>S</span>₃+6<span>HNO</span>₃= 2AI(NO₃)₃ + 3H₂S↑
<span>
5.CaCO</span>₃+2<span>HCI = CaCI</span>₂ + CO₂↑ + H₂O
<span>
6.AgNO</span>₃<span>+HCl = AgCI</span>↓<span> + HNO</span>₃
<span>
7.3Mg+2H</span>₃<span>PO</span>₄ = Mg₃(PO₄)₂ + 3H₂↑
<span>
8.P</span>₂<span>O</span>₅ +3<span>H</span>₂O=2H₃PO₄
<span>
9.Cu(NO</span>₃)₂ +<span>Zn = Zn(NO</span>₃<span>)</span>₂ + Cu↓
<span>
10.Na</span>₂<span>CO</span>₃+<span> 2HNO</span>₃=2NaNO₃ + CO₂↑ +H₂O
<span>
11.Mg(OH)</span>₂ +<span>H</span>₂<span>SO</span>₄ = MgSO₄ + 2H₂O
<span>
12.Al</span>₂<span>O</span>₃+6<span>HCI=2AICI</span>₃ + 3H₂O