1.

\(a.\)

\(V_{hh}=\left(0.1+0.2+0.02+0.03\right)\cdot24=8.4\left(l\right)\)

\(b.\)

\(V_{hh}=\left(0.04+0.015+0.06+0.08\right)\cdot24=4.68\left(l\right)\)

\(2.\)

\(a.\)

\(V_{H_2}=0.5\cdot22.4=11.2\left(l\right)\)

\(V_{O_2}=0.8\cdot22.4=17.92\left(l\right)\)

\(b.\)

\(V_{CO_2}=2\cdot22.4=44.8\left(l\right)\)

\(V_{CH_4}=3\cdot22.4=67.2\left(l\right)\)

\(c.\)

\(V_{N_2}=0.9\cdot22.4=20.16\left(l\right)\)

\(V_{H_2}=1.5\cdot22.4=33.6\left(l\right)\)

Bài 1:

\(n_{KNO_3}=\dfrac{20}{101}=0,198\left(mol\right)\)

\(C_M=\dfrac{n}{V}=\dfrac{0,198}{0,85}=0,233M\)

Bài 2:

\(C_M=\dfrac{n}{V}=\dfrac{0,5}{0,75}=0,66M\)

Bài 3:

\(n_{KNO_3}=2.0,5=1\left(mol\right)\)

\(m_{KNO_3}=1.101=101\left(g\right)\)

Bài 4:

\(C\%=\dfrac{20}{600}.100=3,33\%\)

Bài 1:

\(n_{KNO_3}=\dfrac{20}{101}=0,198\left(mol\right)\)

\(C_{M_{ddKNO_3}}=\dfrac{0,198}{0,85}\approx0,23M\)

Bài 2:

\(C_{M_{ddKCl}}=\dfrac{0,5}{0,75}\approx0,667M\)

Bài 3:

\(n_{KNO_3}=0,5.2=1\left(mol\right)\Rightarrow m_{KNO_3}=1.101=101\left(g\right)\)

Bài 4:

\(C\%_{ddKCl}=\dfrac{20.100\%}{600}=3,333\%\)

`#3107.101107`

`a)`

\(2\text{Mg}\left(\text{NO}_3\right)_2\rightarrow2\text{MgO}+4\text{NO}_2+\text{O}_2\)

`b)`

n của \(\text{Mg}\left(\text{NO}_3\right)_2\) trong phản ứng là:

\(\text{n}_{\text{Mg}\left(\text{NO}_3\right)_2}=\dfrac{\text{m}}{\text{M}}=\dfrac{14,8}{24+\left(14+16\cdot3\right)\cdot2}=\dfrac{14,8}{148}=0,1\left(\text{mol}\right)\)

Theo PT:  2   :   2   :   4   :   1  (mol)

`=>`\(\text{n}_{\text{Mg}\left(\text{NO}_3\right)_2}=\text{n}_{\text{MgO}}=2\text{n}_{\text{NO}_2}=\dfrac{1}{2}\text{n}_{\text{O}_2}\)

`=>` \(\text{n}_{\text{NO}_2}=\dfrac{0,1}{2}=0,05\left(\text{mol}\right)\) ; \(\text{n}_{\text{O}_2}=0,1\cdot2=0,2\left(\text{mol}\right).\)

Tỉ lệ mol của 2 khí NO₂ và NO là 1:1, khí O₂ không đủ nên giả sử mol pứ đều là: x (mol)

2NO₂ + ½ O₂ + H₂O → 2HNO₃

x→      0,25x                      x

2NO + 1,5O₂ + H₂O → 2HNO₃

x   → 0,75x                       x

pứ:       x                           2x

n_O2 = 0,03 => x = 0,03

=> n_HNO3 = 0,06

m_{bình sau pứ} = _N2 + m_O2 + m_H2O+ m_NO2 + m_NO = 28 . 0,12 + 32 . 0,03 + 40 + 19 . 2 . 0,04 = 45,84g

=> %HNO₃ = 8,246%

Đáp án C

a) $n_{Fe_2O_3} = \dfrac{24}{160} = 0,15(mol)$
$n_{H_2SO_4} =0,2.2,5 = 0,5(mol)$

b)

$Fe_2O_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 3H_2O$

Vì : 

$n_{Fe_2O_3} : 1 < n_{H_2SO_4} : 3$ nên $H_2SO_4$ dư

$n_{H_2SO_4\ pư} = 3n_{Fe_2O_3} = 0,45(mol)$
$n_{H_2SO_4\ dư} = 0,5 - 0,45 = 0,05(mol)$
c)

$n_{Fe_2(SO_4)_3} = n_{Fe_2O_3} = 0,15(mol)$

$C_{M_{Fe_2(SO_4)_3}} = \dfrac{0,15}{0,2} = 0,75M$
$C_{M_{H_2SO_4}} = \dfrac{0,05}{0,2} = 0,25M$

1 thiếu m dd H₂SO₄ hoặc D nhé

2

\(a\) \(n_{HCl}=\dfrac{3,65}{36,5}=0,1mol\)

\(C_{M_{HCl}}=\dfrac{0,1}{0,2}=0,5M\)

\(b\) \(C_{M_{H_2SO_4}}=\dfrac{0,2}{0,2}=1M\)