дано
m(P) = 12.4 g
V(O2) -?
n(P2O5) -?
4P+5O2-->2P2O5
M(P) =31 g/mol
n(P) = m/M =12.4 / 31 = 0.4 mol
4n(P) = 5n(O2)
n(O2) = 0.4 * 5 / 4 = 0.5 mol
V(O2) = Vm*n = 22.4 * 0.5 = 11.2 L
4n(P) = 2n(P2O5)
n(P2O5) = 0.4 * 2 / 4 = 0.1 mol
ответ 11.2 л, 0.1 моль
4.
дано
m(P2O5) = 56.8 g
n(P) - ?
4P+5O2-->2P2O5
M(P2O5) = 142 g/mol
n(P2O5) = m/M = 56.8 / 142 = 0.4 mol
n(P) = 4*0.4 / 2 = 0.8 mol
ответ 0.8 моль
5.
дано
m(Fe3O4) = 5.3 g
V(H2)-?
Fe3O4+4H2-->3Fe+4H2O
M(Fe3O4) = 232 g/mol
n(Fe3O4) = m/M = 5.3 / 232 = 0.023 mol
n(Fe3O4) = 4n(H2)
n(H2) = 0.023 * 4 = 0.092 mol
V(H2) = n*Vm = 0.092 * 22.4 = 2.06 L
ответ 2.06 л
Объяснение:
2.
x 50g
Zn+H2SO4=ZnSO4+H2
65g 98g
x=50*65/98=33g
3.m(FeSO4)=500*0.1=50g
4.
v=0.44-0.22/12min=0/02mol/L*min
5.
xmol 4g
2H2O=2H2+O2
2mol 32g
x=2*4/32=0.25mol
6.m(NaCl)=300*0.05=15g
7.mNi=2000*0.12=240kg
mCr=2000*0.08=160kg
mFe=2000*0.8=1600kg
8.
10L xL
N2+3H2=2NH3
1mol 3mol
x=10*3/1=30L
9.
27g 14g xg
CuCl2+Fe=FeCl2+Cu
135g 56g 64g
nCuCl2=27/135=0.2mol
nFe=14/56=0.25molв избытке
ч=27*64.135=12.8g
10. VO2=500*0.21=105m(3)
VN2=500*0.78=390m(3)
11.
11.2L xL
N2+3H2=2NH3
22.4L 44.8L
x=11.2*44.8/22.4=22.4L
12. MCxSe=38*2=79g/mol
nC=15.8/12=1.26 nS=84.2/32=2.6
1.26:2.6=1:2
CS2
13.M=1.69*22.4=38g/mol
D(H2)=38/2=19 F2
14.
xg 11g
CaCO3=CaO+CO2
100g 44g
x=100*11/44=25g
w=25/30*100%=83%
15.
xL yL 0.2mol
2H2 +O2= 2H2O
44.8L 22.4L 2mol
x=44.8*0.2/2=4.48L
y=22.4*0.2/2=2.24L
16. mcem=200*0.3=60kg
mpes=200*0.7=140kg
17.mr-ra=47.5+2500=2547.5g
w=2500/2547.5*100%=98%
18.
1kg xmol
S+O2=SO2 2SO2+O2=2SO3
32g 1mol
x(SO2)=1000*1/32=31.25mol
x(SO3)=2nSO2=31.25*2=62.5mol
19.mKOH=56*1.5=84g
mr-ra=84*1.05=88.2g
wKOH=84/88.2*100%=95.2%
20. гремучая ртуть Hg(CNO)2*0.5H2O
21.
5.6L xL
N2+3H2=2NH3
22.4L 44.8L
x=5.6*44.8/22.4=11.2L
22. a) Dvozd/H2=29/2=14.5
b) Dv/v=29/29=1
23.M=1.25*22.4=28g/mol
24.
422g xg
MgCO3=MgO+CO2
84g 40g
x=422*40/84=201g
w=19/2018100%=9.5%
25. mC=4.4*12/44=1.2g
mH=2.7*2/18=0.3g
M=1.59*29=133g/mol
С:Н=1.2/12 : 0.3/1=1:3
n(CH3)=133
n*15=133
n=9
C9H20 нонан