H3PO4 M(H3PO4)=1*3+31+16*4=98g/mol W(H)=1*3/98*100%=3.06% W(P)=31/98*100%=31.63% W(O)=16*4/98*100%=65.31% 4) Дано V(NH3)-11.2 L ------------------- m(NH3)-? N(NH3)-? M(NH3)=17g/mol Vm=22.4 L/mol m(NH3)=17*11.2/22.4=8.5 g N(NH3)=m/M*N(A)=8.5/17*6.02*10^23=3.01*10^23 ответ 8.5 г. 3.01*10^23 молекул 5) дано N(H2SO4)=18.06*10^23 ------------------------- V(h2SO4)-?, m-? Vm=22/4L/mol, M(H2SO4)=98 g/mol V=Vm*N/N(A)=22.4*18.06*10^23/6.02*10^23=67.2 L m=N*M/N(A)=18.06*10^23*98/6.02*10^23=294 g ответ 67.2 л, 294 г 6) дано m(Cu(NO3)2=100 g ---------------------------- v-? , N-? Vm=22.4 L/mol M(Cu(NO3)2=187.5g/mol N(A)=6.02*10^23 N=N(A)*m/M=6.02*10^23*100/187.5=3.21*10^23 V=Vm*N/N(A)=22.4*3.21*10^23/6.02*10^23=11.94 L ответ 11.94 л. 6.02*10^23 молекул 7) масса вещества =1000*0.9%/100%=9г ответ 9 г 8) W(сахара)=m(сахара)/m(сахар+вода)*100%=250/750+250*100%=25% ответ 25%
Answers & Comments
Al(NO3)3
M(Al(NO3)3)=27+(14+16*3)*3=217g/mol
W(AL)=27/217*100%=12.44%
W(N)=14*3/217*100%=19.35%
W(O)=16*9/217*100%=66.36%
2)
MgOHBr
M(MgOHBr)=24+16+1+80=121g/mol
W(Mg)=24/121*100%=19.83%
W(O)=16/121*100%=13.22%
W(H)=1/121*100%=0.83%
W(Br)=80/121*100%=66.12%
3)
H4O2O7
M(H4P2O7)=1*4+31*2+16*7=178g/mol
W(H)=1*4/178*100%=2.25%
W(P)=31*2/178*100%=34.83%
W(O)=16*7/178*100%=62.92%
H3PO4
M(H3PO4)=1*3+31+16*4=98g/mol
W(H)=1*3/98*100%=3.06%
W(P)=31/98*100%=31.63%
W(O)=16*4/98*100%=65.31%
4)
Дано
V(NH3)-11.2 L
-------------------
m(NH3)-? N(NH3)-?
M(NH3)=17g/mol
Vm=22.4 L/mol
m(NH3)=17*11.2/22.4=8.5 g
N(NH3)=m/M*N(A)=8.5/17*6.02*10^23=3.01*10^23
ответ 8.5 г. 3.01*10^23 молекул
5)
дано
N(H2SO4)=18.06*10^23
-------------------------
V(h2SO4)-?, m-?
Vm=22/4L/mol, M(H2SO4)=98 g/mol
V=Vm*N/N(A)=22.4*18.06*10^23/6.02*10^23=67.2 L
m=N*M/N(A)=18.06*10^23*98/6.02*10^23=294 g
ответ 67.2 л, 294 г
6)
дано
m(Cu(NO3)2=100 g
----------------------------
v-? , N-?
Vm=22.4 L/mol
M(Cu(NO3)2=187.5g/mol
N(A)=6.02*10^23
N=N(A)*m/M=6.02*10^23*100/187.5=3.21*10^23
V=Vm*N/N(A)=22.4*3.21*10^23/6.02*10^23=11.94 L
ответ 11.94 л. 6.02*10^23 молекул
7)
масса вещества =1000*0.9%/100%=9г
ответ 9 г
8)
W(сахара)=m(сахара)/m(сахар+вода)*100%=250/750+250*100%=25%
ответ 25%