1) дано
m(O2)= 80 g
---------------
m(Al2O3)-?
n(Al2O3)-?
80 X
4Al+3O2-->2Al2O3 M(Al2O3)=102 g/mol M(O2)= 32 g/mol
3*32 2*102
X= 204*80 / (3*32) = 170 g
n(Al2O3) = m/M= 170 / 27 = 1.67 mol
ответ 170 г, 1.67 моль
2. дано
m(HCL)= 142 g
----------------------
V(H2)-?
X 142
H2+CL2-->2HCL Vm=22.4 L/mol M(HCL)= 36.5 g/mol
22.4 2*36,5
X= 22.4*142 / 73 = 43.6 L
ответ 43.6 л
3.
дано
m(O2)= 48 g
-------------------
m(P2O5)-?
n(P2O5)-?
48 X
4P+5O2-->2P2O5 M(O2)= 32 g/mol M(P2O5) = 142 g/mol
5*32 2*142
X= 48*284 / 160 = 85.2 g
n(P2O5)= m/M= 85.2 / 142 = 0.6 mol
ответ 85.2 г, 0.6 моль
4. дано
m(Zn) = 195 g
--------------------
m(H2)-?
n(H2)-?
V(H2)-?
Zn+2HCL-->ZnCL2+H2
M(Zn)= 65 g/mol
n(Zn) = 195 / 65 = 3 mol
n(Zn)=n(H2)= 3 mol
n(H2)= 3 mol
m(H2) = n*M(H2) = 3*2 = 6 g
V(H2)=n(H2)*Vm = 3*22.4 = 67.2 L
ответ 6 г, 3 моль, 67.2 л
5.
дано
m(H2O)= 108 g
----------------------
m(O2)-?
V(O2)-?
n(O2)-?
108 X
2H2O-->2H2+O2 M(H2O)= 18 g/mol M(O2)= 32 g/mol
2*18 32
X= 108*32 / 36 = 96 g
n(O2)= m/M = 96/32 = 3 mol
V(O2)= n*Vm= 3*22.4 = 67.2 L
ответ 96 г, 3 моль , 67.2 л
6. дано
N(N2)= 1.806*10^23
------------------------------
V(NO)-?
N2+O2-->2NO
n(N2)= N(N2) / N(A) = 1.806 *10^23 / 6.02*10^23 = 0.3 mol
n(N2)= 2n(NO)
n(NO)=2*0.3 = 0.6 mol
V(NO)= n(NO)*Vm = 0.6*22.4 = 13.44 L
ответ 13.44 л