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a) Giả sử có 100 gam hỗn hợp
=> \(m_S=\dfrac{100.22,61}{100}=22,61\left(g\right)\)
=> \(n_S=\dfrac{22,61}{32}=\dfrac{2261}{3200}\left(mol\right)\)
Mà nO = 4nS
=> \(n_O=\dfrac{2261}{800}\left(mol\right)\)
\(\%m_O=\dfrac{\dfrac{2261}{800}.16}{100}.100\%=45,22\%\)
b)
\(n_{Fe}=\dfrac{18.10^{24}}{6.10^{23}}=30\left(mol\right)\)
=> \(n_{Fe_2\left(SO_4\right)_3}=15\left(mol\right)\)
Gọi số mol CuSO4 là x (mol)
=> mhh = 160x + 6000 (g)
nS = 15.3 + x = x + 45 (mol)
\(\%m_S=\dfrac{\left(x+45\right).32}{160x+6000}.100\%=22,61\%\)
=> x = 20 (mol)
mhh = 160.20 + 6000 = 9200 (g)
a) Trong 1 mol A có 0,25 mol NOx, 0,25 mol O2, 0,5 mol H2
Có \(M_{NO_x}=\dfrac{11,5}{0,25}=46\left(g/mol\right)\)
=> x = 2
=> NOx là NO2 (Nito đioxit)
b) \(\overline{M}_A=\dfrac{0,5.2+0,25.32+0,25.46}{1}=20,5\left(g/mol\right)\)
=> \(d_{A/kk}=\dfrac{20,5}{29}=0,707\)
a)Giả sử có 1mol hhA.
\(\%V_{H_2}=50\%=\%n_{H_2}\)\(\Rightarrow n_{H_2}=1\cdot50\%=0,5mol\)
\(\%V_{O_2}=25\%=\%n_{O_2}\Rightarrow n_{O_2}=1\cdot25\%=0,25mol\)
\(n_{NO_x}=1-0,5-0,25=0,25mol\)
\(M_{NO_x}=\dfrac{m}{n}=\dfrac{11,5}{0,25}=46đvC\)
\(\Rightarrow14+16x=46\Rightarrow x=2\)
Vậy CTHH cần tìm là \(NO_2:nitođioxit\)
b)\(\overline{M_A}=\dfrac{m_{H_2}+m_{O_2}+m_{NO_x}}{n_{H_2}+n_{O_2}+n_{NO_x}}=\dfrac{0,5\cdot2+0,25\cdot32+0,25\cdot46}{0,5+0,25+0,25}=20,5đvC\)
\(d_A\)/KK=\(\dfrac{20,5}{29}=0,71\)
Gọi \(n_{C_{12}H_{22}O_{11}}=x\left(mol\right);n_{NaCl}=y\left(mol\right)\)
\(Tacó:\left\{{}\begin{matrix}342x+58,5y=129,375\\y=3x\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,25\\y=0,75\end{matrix}\right.\)
Vậy \(n_{C_{12}H_{22}O_{11}}=0,25\left(mol\right);n_{NaCl}=0,75\left(mol\right)\)
\(n_{H_2SO_4}=5a\left(mol\right),n_{HCl}=3a\left(mol\right)\)
\(m=98\cdot5a+36.5\cdot3a=5.995\left(g\right)\)
\(\Rightarrow a=0.01\)
\(n_{H_2SO_4}=0.05\left(mol\right),n_{HCl}=0.03\left(mol\right)\)
\(b.\)
\(n_{H_2SO_4}=0.025\left(mol\right),n_{HCl}=0.015\left(mol\right)\)
\(n_{CO}=x\left(mol\right),n_{CO_2}=y\left(mol\right)\)
\(n_B=x+y=0.025+0.015=0.04\left(mol\right)\left(1\right)\)
\(m_B=28x+44y=2.16\left(g\right)\left(2\right)\)
\(\left(1\right),\left(2\right):\) Không biết sao tới chổ này số mol âm mất em ơii
\(a)\\ C + O_2 \xrightarrow{t^o} CO_2\\ S + O_2 \xrightarrow{t^o} SO_2\\\)
\(b)\ n_C = a(mol) ; n_{S} = b(mol)\\ \Rightarrow 12a + 32b = 5,6 ; n_{O_2} = a + b = \dfrac{9,6}{32} = 0,3\\ \Rightarrow a = 0,2 ; b = 0,1\\ m_C = 0,2.12 = 2,4(gam) ; m_S = 0,1.32 = 3,2(gam)\\ c)\\ \Rightarrow \%m_C = \dfrac{0,2.12}{5,6}.100\% = 42,96\%\\ \%m_S = \dfrac{0,1.32}{5,6}.100\% = 57,14\%\)
\(d)\ n_{CO_2} = n_C = 0,2(mol)\\ n_{SO_2} = n_S = 0,1(mol)\\ \Rightarrow \%V_{CO_2} = \dfrac{0,2}{0,2 + 0,1}.100\% = 66,67\%\\ \%V_{SO_2} = 100\% - 66,67\% = 33,33\%\)
a. Đặt \(5a\left(mol\right)=n_{H_2SO_4}\rightarrow3a\left(mol\right)=n_{HCl}\)
\(m_{hh}=m_{H_2SO_4}+m_{HCl}\)
\(\rightarrow5,995=5a.98+3a.36,5\)
\(\rightarrow a=0,01mol\)
\(\rightarrow\hept{\begin{cases}n_{H_2SO_4}=0,05mol\\n_{HCl}=0,03mol\end{cases}}\)
b. \(M_A=\frac{5,995}{0,05+0,03}=74,9375g/mol\)
\(\rightarrow n_A=\frac{2,9975}{74,9375}=0,04mol\)
Vì \(V_A=V_B\rightarrow n_A=n_B=0,04mol\)
Đặt \(\hept{\begin{cases}x=n_{CO}\\y=n_{CO_2}\end{cases}}\)
\(\rightarrow x+y=n_B=0,04\left(1\right)\)
Vì \(m_B=2,16=m_{CO}+m_{CO_2}\)
\(\rightarrow28x+44y=2,16\left(2\right)\)
Từ (1) và (2) => x = -0,025 và y = 0,065
a)
\(n_{H_2}=\dfrac{0,336}{22,4}=0,015\left(mol\right)\)
PTHH: 2Na + 2H2O --> 2NaOH + H2
0,03<------------0,03<----0,015
=> \(\%m_{Na}=\dfrac{0,03.23}{1,31}.100\%=52,67\%\)
=> \(\%m_{Na_2O}=100\%-52,67\%=47,33\%\)
b)
\(n_{Na_2O}=\dfrac{1,31.47,33\%}{62}=0,01\left(mol\right)\)
PTHH: Na2O + H2O --> 2NaOH
0,01----------->0,02
=> nNaOH = 0,03 + 0,02 = 0,05 (mol)
mdd sau pư = 1,31 + 18,72 - 0,015.2 = 20 (g)
=> \(C\%_{dd.NaOH}=\dfrac{0,05.40}{20}.100\%=10\%\)
\(V_{dd.NaOH}=\dfrac{20}{1,2}=\dfrac{50}{3}\left(ml\right)=\dfrac{1}{60}\left(l\right)\)
\(C_{M\left(dd.NaOH\right)}=\dfrac{0,05}{\dfrac{1}{60}}=3M\)
a) \(n_{MgO}=\dfrac{16}{40}=0,4\left(mol\right)\)
=> nMg = 0,4 (mol)
=> mMg = 0,4.24 = 9,6 (g)
b) nMg = 0,4 (mol) => nX = 0,6 (mol)
mX = 33,6 - 9,6 = 24 (g)
=> \(M_X=\dfrac{24}{0,6}=40\left(g/mol\right)\)
=> X là Ca
c)
PTHH: 2Mg + O2 --to--> 2MgO
2Ca + O2 --to--> 2CaO
\(m_{O_2}=49,6-33,6=16\left(g\right)\)
=> \(n_{O_2}=\dfrac{16}{32}=0,5\left(mol\right)\)
=> VO2 = 0,5.22,4 = 11,2 (l)
=> Vkk = 11,2.5 = 56 (l)
Gọi \(n_{CuSO_4}=n_{CaCO_3}=a\left(mol\right)\)
`=> 160a + 100a = 52`
`=> a = 0,2 (mol) = n_{CuSO_4} + n_{CaCO_3}`