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a) \(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(m_{SO_2}=0,1.64=6,4\left(g\right)\)
\(n_{O_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(m_{O_2}=0,15.32=4,8\left(g\right)\)
mhỗn hợp = 6,4 + 4,8 = 11,2(g)
b) \(n_{CO_2}=\dfrac{4,4}{44}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{3,2}{32}=0,1\left(mol\right)\)
nhỗn hợp = 0,1 + 0,1 = 0,2 (mol)
Vhỗn hợp(đktc) = 0,2.22,4 = 4,48(l)
c) \(n_{H_2O}=\dfrac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
- Thấy tỉ lệ số phân tử cũng là tỉ lệ mol .
a, Ta có : \(\dfrac{n_{CO}}{1}=\dfrac{n_{CO2}}{2}=\dfrac{n_{SO_2}}{5}\)
Mà tổng số mol = \(\dfrac{V}{22,4}=3,2\left(mol\right)\)
- Áp dụng dãy tính chất tỉ số bằng nhau :
\(\Rightarrow\left\{{}\begin{matrix}n_{CO}=0,4\\n_{CO_2}=0,8\\n_{SO_2}=2\end{matrix}\right.\) mol
\(\Rightarrow\left\{{}\begin{matrix}m_{CO}=11,2\\m_{CO_2}=35,2\\m_{SO_2}=128\end{matrix}\right.\) ( g )
b, Ta có : \(\overline{M_Y}=\dfrac{m}{n}=54,5\)
\(\Rightarrow d_{\dfrac{y}{kk}}=~1,9\)
a)
Gọi $n_{CO} = a(mol) \to n_{CO_2} = 2a(mol) ; n_{SO_2} = 5a(mol)$
Ta có :
$a+ 2a + 5a = \dfrac{71,68}{22,4} = 3,2$
$\Rightarrow a = 0,4(mol)$
$m_{CO} = 0,4.28 = 11,2(gam)$
$m_{CO_2} = 0,4.2.44 = 35,2(gam)$
$m_{SO_2} = 0,4.5.64 = 128(gam)$
b)
$M_Y = \dfrac{11,2 + 35,2 + 128}{3,2} = 54,5(g/mol)$
$d_{Y/kk} = \dfrac{54,5}{29} = 1,88$
a) mCuSO4 = n.M = 0,2 x 160 = 32 (gam)
b) VSO2(đktc) = n.22,4 = 0,45 x 22,4 = 10,08 (lít)
c)???
d) mAl(OH)3 = n.M = 0,3 x 78 = 23,4 gam
e) VSO2(đktc) = n.22,4 = 0,45 x 22,4 = 10,08 lít
a/ Ta có: \(n_{Mg}=\dfrac{4.8}{24}=0.2\left(mol\right)\)
PTHH:
\(2Mg+O_2\underrightarrow{t^o}2MgO\)
2 1
0.2 x
\(=>x=\dfrac{0.2\cdot1}{2}=0.1=n_{O_2}\)
\(=>V_{O_2\left(đktc\right)}=0.1\cdot22.4=2.24\left(l\right)\)
b/ \(2Mg+O_2\underrightarrow{t^o}2MgO\)
2 2
0.2 y
\(=>y=\left(0.2\cdot2\right):2=0.2=n_{MgO}\)
\(=>m_{MgO}=0.2\cdot\left(24+16\right)=8\left(g\right)\)
a) $n_{H_2SO_4} = \dfrac{44,1}{98} = 0,45(mol)$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH :
$n_{Al} = \dfrac{2}{3}n_{H_2SO_4} = 0,3(mol)$
$m_{Al} = 0,3.27 = 8,1(gam)$
b) $n_{H_2} = n_{H_2SO_4} = 0,45(mol)$
$\Rightarrow V_{H_2} = 0,45.22,4 =1 0,08(lít)$
c)
Cách 1 : $n_{Al_2(SO_4)_3} = \dfrac{1}{3}n_{H_2SO_4} = 0,15(mol)$
$\Rightarrow m_{Al_2(SO_4)_3} = 0,15.342 = 51,3(gam)$
Cách 2 : Bảo toàn khối lượng, $m_{Al_2(SO_4)_3} = 8,1 + 44,1 - 0,45.2 = 51,3(gam)$
a/ \(n=\frac{A}{6.10^{23}}\left(mol\right)\) ( Chú thích: A là số nguyên tử hoặc phân tử)
b/ n = \(\frac{m}{M}\left(mol\right)\)
c/ n = \(\frac{V}{22,4}\left(mol\right)\)
2Zn+O2-to>2ZnO
0,1---0,05----0,1
n Zn=0,1 mol
nO2=0,025 mol
=>VO2=0,05.22,4=1,12l
=>mZnO=0,1.81=8,1g
c)Zn dư
=>m ZnO=0,05.81=4,05g
2Zn+O2-to>2ZnO
0,1---0,05----0,1
n Zn=6,5/65=0,1 mol
n O2=0,8/32=0,025 mol
=>VO2=0,05.22,4=1,12l
=>mZnO=0,1.81=8,1g
c)Zn dư
=>m ZnO=0,05.81=4,05g
Ta có: \(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\)
a. \(PTHH:4P+5O_2\overset{t^o}{--->}2P_2O_5\)
Theo PT: \(n_{O_2}=\dfrac{5}{4}.n_P=\dfrac{5}{4}.0,2=0,25\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,25.22,4=5,5\left(lít\right)\)
b. Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}.n_P=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)
\(\Rightarrow m_{P_2O_5}=0,1.142=14,2\left(g\right)\)
\(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\\ 4P+5O_2-^{t^o}\rightarrow2P_2O_5\\ a.n_{O_2}=\dfrac{5}{4}n_P=0,25\left(mol\right)\\ \Rightarrow m_{O_2}=0,25.32=8\left(g\right)\\ b.BTKLm_P+m_{O_2}=m_{P_2O_5}\\ \Rightarrow m_{P_2O_5}=6,2+8=14,2\left(g\right)\)
Bài 1 :
a) nH = \(\frac{6.10^{23}}{6.10^{23}}=1\left(mol\right)\)
\(\Rightarrow m_H=1.1=1\left(g\right)\)
b) \(n_{O_2}=\frac{V}{22,4}=\frac{22,4}{22,4}=1\left(mol\right)\)
\(\Rightarrow m_{O_2}=1.32=32\left(g\right)\)
Bài 2 :
a) \(n_{CO_2}=\frac{6.10^{23}}{6.10^{23}}=1\left(mol\right)\)
\(\Rightarrow V=24.1=24\left(l\right)\)
b) \(n_{H_2O}=\frac{36}{18}=2\left(mol\right)\)
\(\Rightarrow V=2.22,4=44,8\left(l\right)\)
c) \(n_{C_2H_6O}=\frac{92}{46}=2\left(mol\right)\)
\(\Rightarrow V=2.22,4=44,8\left(l\right)\)
Bài 1.
a) \(m_{CO_2}=n_{CO_2}\times M_{CO_2}=2,5\times44=110\left(g\right)\)
b) \(n_{SO_2}=\frac{V_{SO_2}}{22,4}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(m_{SO_2}=n_{SO_2}\times M_{SO_2}=0,1\times64=6,4\left(g\right)\)
Bài 2.
a) \(n_{CO_2}=\frac{m_{CO_2}}{M_{CO_2}}=\frac{4,4}{44}=0,1\left(mol\right)\)
\(V_{CO_2}=n_{CO_2}\times22,4=0,1\times22,4=2,24\left(l\right)\)
b) Ta có 1 mol NH3 = 6.1023 phân tử NH3
=> 3.1023 phân tử NH3 = 0, 5 mol NH3
\(V_{NH_3}=n_{NH_3}\times22,4=0,5\times22,4=11,2\left(l\right)\)
Bài 1:
a) \(m_{CO_2}=n.M=2,5.44=110\left(g\right)\)
b) \(n_{SO_2}=\frac{V}{22,4}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(\Leftrightarrow m_{SO_2}=n.M=0,1.64=6,4\left(g\right)\)
Bài 2:
a) \(n_{CO_2}=\frac{m}{M}=\frac{4,4}{44}=0,1\left(mol\right)\)
\(\Leftrightarrow V_{CO_2}=n.22,4=0,1.22,4=2,24\)(lít)
b) \(n_{NH_3}=\frac{a}{N}=\frac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
\(\Leftrightarrow V_{NH_3}=n.22,4=0,5.22,4=11,2\)(lít)
Lưu ý: a là số phân tử.