a)
n(Fe)=28/56=0.5 mol
n(Cu)=64/64=1 mol
n(Al)=5.4/27=0.2 mol
b)
V(CO2)=0.175*22.4=3.92 lít
V(H2)=1.25*22.4=28 lít
V(N2)=3*22.4=67.2 lít
c)
n(CO2)=0.44/44=0.01 mol
n(H2)=0.04/2=0.02 mol
n(N2)=0.56/28=0.02 mol
V(hh)= (0.01+0.02+0.02)*22.4=1.12 lít

n Fe = 28/56= 0,5 mol

n cu = 6,4 / 64= 0,1 mol

n Al = 5,4 / 27 =0,2 mol

V CO2 = 0,75 . 22,4 =16,8 l

V H2 = 1,25 . 22,4 = 28 l

 V N2 = 3 . 22,4 =67,2 l

trời

a, nFe= \(\dfrac{28}{56}=0,5\) mol

nCu= \(\dfrac{64}{64}=1\) mol

nAl= \(\dfrac{5,4}{27}=0,2\) mol

b, VCO2= 0,175.22,4= 3,92 (l)

VH2= 1,25.22,4= 28 (l)

VN2= 3.22,4= 67,2 (l)

c, mA= \(\dfrac{12,25}{0,125}=98\) (g/mol)

lớp 8 mình ko biết nên bạn tham khảo nha 

n Fe = 28/56= 0,5 mol

n cu = 6,4 / 64= 0,1 mol

n Al = 5,4 / 27 =0,2 mol

V CO2 = 0,75 . 22,4 =16,8 l

V H2 = 1,25 . 22,4 = 28 l

 V N2 = 3 . 22,4 =67,2 l

chúc bạn học tốt 

\(n_{Fe}=\frac{m}{M}=\frac{28}{56}=0,5\left(mol\right)\); 

\(n_{Cu}=\frac{m}{M}=\frac{64}{64}=1\left(mol\right)\)

\(n_{Al}=\frac{m}{M}=\frac{5,4}{27}=0,2\left(mol\right)\)

đây nhé

a)mFe=28g

MFe=56g

nFe=?

nFe=\(\dfrac{28}{56}\) =0,5mol

tương tự

nCu=\(\dfrac{64}{64}\) =1mol

nAl=\(\dfrac{5,4}{27}\) =0,2mol

b)tóm tắt

nCO2=0,175mol

V1molCO2=22,4(l)

V=?

VCO2=0,175x22,4=3,92(l)

tương tự

VH2=1,25x22,4=28(l)

VN2=3x22,4=67,2(l)

c)tóm tắt

mCO2=0,44g

MCO2=44g

V1molCO2=22,4(l)

nCO2=?

VCO2=?

nCO2=\(\dfrac{0,44}{44}\) 0,01,mol

VCO2=0,01x22,4=0,224(l)

tương tự

nH2=\(\dfrac{1,25}{2}\) 0,625mol

VH2=0,625x22,4=149(l)

nN2=\(\dfrac{0,56}{14}\) 0,04mol

VN2=0,04x22,4=0,896(l)

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.

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

\(a.n=\dfrac{m}{M}=\dfrac{28}{56}=0,5\left(mol\right)\)

\(b.V=\dfrac{n}{22,4}=\dfrac{0,5}{22,4}=0,022\left(l\right)\)

\(c.m=n.M=0,5.28=14\left(g\right)\)

a) n_Fe= \(\frac{5,6}{56}\)= 0,1 mol

n_Cu= \(\frac{64}{64}\)= 1mol

n_Al= \(\frac{27}{27}\)= 1 mol

b)

n_CO2= \(\frac{44}{12+16.2}\)= 1 mol

n_H2= \(\frac{4}{1.2}\)= 2 mol

=> n_hh= 1+2= 3 mol

V_hh= 3.22,4= 67,2 l

a) Số mol Fe trong 5,6 g Fe:

n_Fe=\(\frac{m_{Fe}}{M_{Fe}}=\frac{5,6}{56}=0,1\left(mol\right)\)

Số mol Cu có trong 64 g Cu:

n_Cu=\(\frac{m_{Cu}}{M_{Cu}}=\frac{64}{64}=1\left(mol\right)\)

Số mol Al có trong 27 g Al:

n_Al= \(\frac{m_{Al}}{M_{Al}}=\frac{27}{27}=1\left(mol\right)\)

a) \(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)

\(n_{CaCO_3}=\dfrac{25}{100}=0,25\left(mol\right)\)

\(n_{NaOH}=\dfrac{4}{40}=0,1\left(mol\right)\)

\(n_{...}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)

b) 

\(m_{ZnSO_4}=0,25.161=40,25\left(g\right)\)

\(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)

\(m_{Cu}=0,3.64=19,2\left(g\right)\)

\(m_{Fe_2\left(SO_4\right)_3}=0,35.400=140\left(g\right)\)

d) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)

\(V_{Cl_2}=0,15.22,4=3,36\left(l\right)\)

\(V_{SO_2}=0,3.22,4=6,72\left(l\right)\)