<span>2 <span>H2O</span></span> + <span>2 <span>K0</span></span> → <span>2 <span>KOH</span></span> + <span>H<span>20</span></span><span>
не идет
не идет
</span><span>H2O</span> + <span>CaO</span> → <span>Ca<span>(OH)</span><span>2</span></span>
1. В
2. В
3. Б
4. А
5. А
6.
2Mg + O2 = 2MgO
MgO + H2O = Mg(OH)2
Mg(OH)2 + 2HCl = MgCl2 + 2 H2O
7.
KCl + AgNO3 = KNO3 + AgCl
K+ + Cl- + Ag+ + NO3- = K+ + NO3- + AgCl
Ag+ + Cl- = AgCl
8.
N2O5 + 3H2O = 2 HNO3
HNO3 + NaOH = NaNO3 + H2O
3HNO3 + Fe(OH)3 = Fe(NO3)3 + 3H2O
9.
CuCl2 + 2NaOH = 2NaCl + Cu(OH)2
10.
Дано
m раствора = 300 г
W соли = 2,5%
m(cоли) = 300 х 0,25 =75 г
m(воды) = 300 - 75 = 225 г
2C2H6 + 7O2 → 4CO2 + 6H2O
10 / 2 = X / 7
X = 10 × 7 / 2 = 45 л
45 л — 21%
Z л — 100%
Z = 45 × 100 / 21 = 214,28 л