<span>m(C</span>6<span>H</span>14<span>) = 1 кг = 1000 г</span>
<span>n(C</span>6<span>H</span>14<span>) = m(C</span>6<span>H</span>14<span>) / M(C</span>6<span>H</span>14<span>) = 1000 / 86 = 11.63 моль</span>
<span>2C</span>6<span>H</span>14<span> + 19O</span>2<span> → 12CO</span>2<span> + 14H</span>2<span>O</span>
<span>n(O</span>2<span>) = (19/2) * n(C</span>6<span>H</span>14<span>) = (19/2) * 11.63 = 110.5 моль</span>
<span>V(O</span>2<span>) = n(O</span>2<span>) * V</span>м<span> = 110.5 * 22.4 = 2474 л</span>
<span>ϕ(О</span>2<span>) = 21\% = 0.21</span>
<span>V(воздуха) = V(O</span>2<span>) / ϕ(О</span>2<span>) = 2474 / 0.21 = 11783 л ≈ </span>11.8 м3<span> </span>
масса вещества = 0,20*500 = 100 г
100 г + 40 г=140 г это и есть ответ
1. 1)2Na + 2H20--2NaOH + H2(выделение газа, Mr=2*1=2
2)2NaOH + H2SO4--Na2SO4 + H2O
3)Na2SO4 + 2HCl--2NaCl + H2SO4
2. -3)
3. -3)
4. Ca(OH)2 + 2HCl--CaCl2 + 2H20(сумма коофициентнов = 4)
Вот как-то так, см. фотографию