a, khối lượng của 2,5 mol CuO là:
\(m=n.M=2,5.80=200\left(g\right)\)

b, số mol của 4,48 lít khí CO2 (đktc) là:
\(n=\dfrac{V}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

a.

mCuO=n.M=2,5.(1.64+1.16)= 200 mol

b.nCO₂=V/22,4=4,48:22,4=0,2 mol

\(m_{Cl_2}=1.71=71\left(g\right)\)

\(m_{CH_4}=1.16=16\left(g\right)\)

\(m_{CO_2}=1.44=44\left(g\right)\)

\(m_{K_2O}=1.94=94\left(g\right)\)

\(m_{Fe_2O_3}=1.160=160\left(g\right)\)

\(m_{CuSO_4}=1.160=160\left(g\right)\)

\(m_{NaOH}=1.40=40\left(g\right)\)

\(m_{Fe\left(NO_3\right)_2}=1.242=242\left(g\right)\)

\(m_{Fe\left(OH\right)_2}=1.90=90\left(g\right)\)

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

\(m_{CaCO_3}=0,1.100=10\left(g\right)\)

\(m_{H_2O}=0,5.18=9\left(g\right)\)

\(m_{CuO}=0,15.80=12\left(g\right)\)

\(a,M_R=\dfrac{6}{0,15}=40\left(g/mol\right)\\ b,M_A=\dfrac{m_A}{n_A}=\dfrac{7}{\dfrac{5,6}{22,4}}=\dfrac{7}{0,25}=28\left(g/mol\right)\\ c,\overline{M_{hh}}=\dfrac{4\cdot28+1\cdot32}{4+1}=\dfrac{144}{5}=28,8\left(g/mol\right)\)

a, V_{O\(_2\)} = 0,15 . 22,4 = 3,36 lít

b, V_{\(CO_2\)}  = \((\dfrac{48}{44}).22,4\approx24,43\) ( lít )

c, \(V_{SO_2}=\left(\dfrac{16}{64}\right).22,4=5,6\) ( lít )

\(V_{H_2}=\left(\dfrac{18.10^{23}}{6.10^{23}}\right).22,4=67,2\) ( lít )

=> \(V_{hh}=5,6+67,2=72,8\) ( lít )

Bài 31: 

a, m_{Fe\(_2\)O\(_3\)} = 0,4. 160 = 64( g )

b, \(m_{CO_2}=\left(\dfrac{14,56}{22,4}\right).44=28,6\) ( g )

c, \(m_{O_2}=\left(\dfrac{1,2.10^{23}}{6.10^{23}}\right).32=6,4\) ( g )

a.

\(m_{Al}=0.5\cdot27=13.5\left(g\right)\)

\(m_{CO_2}=\dfrac{6.72}{22.4}\cdot44=13.2\left(g\right)\)

\(m_{N_2}=\dfrac{5.6}{22.4}\cdot28=7\left(g\right)\)

\(m_{CaCO_3}=0.25\cdot100=25\left(g\right)\)

b.

\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)

a . mA= 0,5x32=16 g

b . n=36x10²³/6x10²³=6(mol)

V=6x22,4=134,4 g

Bài 5:

\(m_{Y}=m_{SO_2}+m_{CH_4}=\dfrac{3,36}{22,4}.64+\dfrac{13,44}{22,4}.16=19,2(g)\)

Bài 6:

\(V_{CO_2}=0,15.22,4=3,36(l)\\ V_{NO_2}=0,2.22,4=4,48(l)\\ V_{SO_2}=0,02.22,4=0,448(l)\\ V_{N_2}=0,03.22,4=0,672(l)\)

\(a.\)

\(m_{hh}=m_{SO_2}+m_{CO_2}=0.15\cdot64+0.2\cdot44=18.4\left(g\right)\)

\(n_{hh}=0.15+0.2=0.35\left(mol\right)\)

\(\overline{M}_X=\dfrac{m_{hh}}{n_{hh}}=\dfrac{18.4}{0.35}=52.5\left(\dfrac{g}{mol}\right)\)

\(b.\)

\(d_{X\text{/}NO_2}=\dfrac{52.57}{46}=1.14\)

a)Tính khối lượng trung bình:

Mx=(n*Mso2+n*Mco2)/(nso2+nco2)

Mx=(0.15*64+0.2*44)/0.35

Mx=52.57(g/mol)

b)Ta có:dx/NO2=52.57/Mno2=52.57/46

                                                    =1.143

a) mO2= nO2. M(O2)=0,45. 32=14,4(g)

b) mBaCO3=nBaCO3.M(BaCO3)=0,6.197=118,2(g)

c) mAl2(SO4)3=nAl2(SO4)3.M(Al2(SO4)3)=1,5.342=513(g)

d) nSO2=V(SO2,đktc)/22,4=16,8/22,4=0,7(mol)

=> mSO2=nSO2.M(SO2)=0,7.64=44,8(g)

e) nH2O=(3.10²³):(6.10²³)=0,5(mol)

=>mH2O=nH2O.M(H2O)=0,5.18=9(g)

f) nCO2=V(CO2,đktc)/22,4=8,96/22,4=0,4(mol)

=>mCO2=nCO2.M(CO2)=0,4.44=17,6(g)