a) 

\(n_{SO_2}=\dfrac{m}{M}=\dfrac{3,2}{64}=0,05\left(mol\right)\\ n_{CO_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

b) 

\(n_{Cl_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{1,344}{22,4}=0,06\left(mol\right)\Rightarrow m_{Cl_2}=n.M=0,06.71=4,26\left(mol\right)\\ n_{Na_2CO_3}=n.M=0,5.106=53\left(g\right)\)

c) 

\(V_{N_2\left(\text{đ}ktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\\ n_{O_2}=\dfrac{m}{M}=\dfrac{4,8}{32}=0,15\left(mol\right)\Rightarrow V_{O_2\left(\text{đ}ktc\right)}=n.22,4=0,15.22,4=3,36\left(l\right)\)

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) m_{CuO = 0,25 x 80 = 20 (g)}

a)mCuO=0.25*(64+16)=20(g)

b)\(n_{MgCl_2}=\dfrac{19}{95}=0.2\left(mol\right)\)

Số phân từ MgCl₂ có trong 19g là 
0.2*6*10²³=1,2.10²³

c)
\(V_{hh}=\left(0.2+0.3+\dfrac{6.4}{32}\right).22,4=\left(0.5+0.2\right)=0.7\cdot22,4=15,68\left(l\right)\)

\(a.V_{CO_2\left(dktc\right)}=0,25.22,4=5,6\left(l\right)\)

\(b.m_{Al_2O_3}=0,5.160=80\left(g\right)\)

1.

\(a,n_{Al}=\dfrac{5,4}{27}=0,2(mol)\\ n_{CuO}=\dfrac{8}{80}=0,1(mol)\\ n_{Fe_2O_3}=\dfrac{16}{160}=0,1(mol)\\ b,V_{CO_2}=0,25.22,4=5,6(l)\\ V_{H_2}=0,175.22,4=3,92(l)\\ V_{N_2}=1,5.22,4=33,6(l)\)

2.

\(a,n_{Al}=0,5.2=1(mol);n_{O}=0,5.3=1,5(mol)\\ \Rightarrow m_{Al}=1.27=27(g);m_{O}=1,5.16=24(g)\\ b,n_{CO_2}=\dfrac{2,2}{44}=0,05(mol)\\ \Rightarrow m_C=0,05.12=0,6(g);m_O=0,05.2.16=1,6(g)\)

a, Số mol của 2,8g N2

\(n_{N2}\)=\(\dfrac{m}{M}\)=\(\dfrac{2,8}{28}\)=0,1 (mol)

b, Thể tích 0,75 mol CO2(đktc)

\(V_{CO2}\)=0,75.22,4=16,8 lít

c, Khối lượng của 0,5 mol Fe

M \(m_{Fe}\)=0,5.56=28g

d, Số mol của 1,12 lít khí H2

\(n_{H2}\)=\(\dfrac{1,12}{22,4}\)=0,05 (mol)

e, Khối lượng của \(9.1^{23}\) phân tử \(Ba_{\left(NO3\right)2}\)

  \(m_{Ba\left(NO3\right)2}\)=\(\dfrac{9.10^{23}}{6.10^{23}}\)=1,5 (mol)

SOS

\(a_1,m_{CaCO_3}=0,25.100=25(g)\\ a_2,m_{SO_2}=\dfrac{3,36}{22,4}.64=9,6(g)\\ a_3,m_{H_2SO_4}=\dfrac{9.10^{23}}{6.10^{23}}.98=147(g)\)

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

V h h  = 22,4 n O 2 + n H 2 + n O 2 = 22,4(0,75 + 0,25 + 0,5) = 33,6(l)