\(M_{KNO_3}=39+14+16\cdot3=101g/mol\\ M_{H_2SO_4}=1\cdot2+32+16\cdot4=98g/mol\\ M_{CuSO_4}=64+32+16\cdot4=160g/mol\\ M_{Al\left(OH\right)_3}=27+\left(1+17\right)\cdot3=78g/mol\\ M_{NaCl}=23+35,5=58,5g/mol\)

\(M_{KNO_3}=39+14+16\cdot3=101g/mol\\ M_{H_2SO_4}=1\cdot2+32+16\cdot4=98g/mol\\ M_{CuSO_4}=64+32+16\cdot4=160g/mol\\ M_{Al\left(OH\right)}_{_3}=27+\left(1+16\right)\cdot3=78g/mol\\ M_{NaCl}=23+35,5=58,5g/mol\)

m_CO = n_CO.M_CO = 0,7.28 = 19,6 (g) á :v

\(m_{\text{dung dịch sau phản ứng}}=m_{Al\left(pư\right)}+m_{dd_{H_2SO_4}}-m_{H_2}\)

Khối lượng Al là khối lượng dư sau phản ứng chứ sao tính bằng H₂SO₄ được em.

N(HNO3) +3e------------->N (NO) 
------------0.03mol <-------- 0.01 
N(HNO3) +1e------------>N (NO2) 
------------- 0.04 <--------0.04 
nNO3- = n e(nhận)= 0.03+0.04 = 0.07 mol 
khối lượng muối = m kim loại + mNO3- = 1.35 + 0.07x(14+16*3)=5.69 gam 

PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

Ta có: \(n_{HCl}=0,2.0,3=0,06\left(mol\right)\)

a, Theo PT: \(n_{Al}=\dfrac{1}{3}n_{HCl}=0,02\left(mol\right)\)

\(\Rightarrow m_{Al}=0,02.27=0,54\left(g\right)\)

b, Theo PT: \(n_{AlCl_3}=\dfrac{1}{3}n_{Al}=0,02\left(mol\right)\)

\(\Rightarrow C_{M_{AlCl_3}}=\dfrac{0,02}{0,2}=0,1\left(M\right)\)

\(m_{Mg}=0,675.24=16,2g\)

\(m_{Mg}=n.M=0,675.24=16,2\left(g\right)\)

\(a.M_{Na_2CO_3}=\dfrac{106}{0,2}=530\left(g/mol\right)\)

\(b.n_{O_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

\(c.n_{Cl_2}=\dfrac{7,1}{71}=0,1\left(mol\right)\)

\(\Rightarrow V_{Cl_2}=0,1.22,4=2,24\left(l\right)\)

$n_{H_2O} = \dfrac{1,2.10^{23}}{6.10^{23}} = 0,2(mol)$

$m_{H_2O} = 0,2.18 = 3,6(gam)$

`#3107.101107`

`3,`

a.

Khối lượng phân tử của \(\text{CaCO}_3\) là:

\(\text{M}_{\text{Ca}}+\text{M}_{\text{C}}+\text{M}_{\text{O}_3}=40+12+16\cdot3=100\left(\text{g/mol}\right)\)

b.

Khối lượng của `0,3` mol \(\text{CaCO}_3\) là:

\(\text{m}_{\text{CaCO}_3}=\text{n}_{\text{CaCO}_3}\cdot\text{M}_{\text{CaCO}_3}=0,3\cdot100=30\left(g\right)\)

Vậy: 

a) `100` g/mol

b) `30` g.