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1:
a) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)
______0,2------>0,2------------------->0,2_____(mol)
=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b) \(V_{ddH_2SO_4}=\dfrac{0,2}{1}=0,2\left(l\right)\)
2:
a)
\(n_{HCl}=2.0,2=0,4\left(mol\right)\)
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
______0,2<------0,4------------------>0,2______(mol)
=> \(m_{Mg}=0,2.24=4,8\left(g\right)\)
b) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
a) Gọi $n_{CO_2} = a(mol) ; n_{SO_2} = b(mol)$
Ta có :
$a + b = \dfrac{8,96}{22,4} = 0,4(mol)$
$\dfrac{44a + 64b}{a + b} = 27.2$
Suy ra : a = b = 0,2$
$V_{CO_2} = V_{SO_2} = 0,2.22,4 = 4,48(lít)$
b) Theo PTHH : $n_{K_2SO_3} = n_{SO_2} = 0,2(mol)$
$\Rightarrow m_{K_2SO_3} = 0,2.158 = 31,6(gam)$
Gọi $n_{K_2CO_3} = x(mol) ; n_{Na_2CO_3} = y(mol)$
$\Rightarrow 138x + 106y + 31,6 = 56(1)$
$n_{CO_2} = x + y = 0,2(2)$
Từ (1)(2) suy ra : x = y = 0,1
$m_{K_2CO_3} = 0,1.138 = 13,8(gam) ; m_{Na_2CO_3} = 0,1.106 = 10,6(gam)$
nZn = 19,5/65 = 0,3 (mol)
PTHH: Zn + 2HCl -> ZnCl2 + H2
Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3
VH2 = 0,3 . 22,4 = 6,72 (l)
mHCl = 0,6 . 36,5 = 21,9 (g)
\(n_{Zn}=\dfrac{19,5}{65}=0,3mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,3 0,6 0,3 ( mol )
\(V_{H_2}=0,3.22,4=6,72l\)
\(m_{HCl}=0,6.36,5=21,9g\)
a) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
\(n_{HCl}=0,2.1=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,2}{2}\) => Zn dư, HCl hết
PTHH: Zn + 2HCl --> ZnCl2 + H2
__________0,2-------------->0,1
=> VH2 = 0,1.22,4 = 2,24(l)
b)
PTHH: 2H2 + O2 --to--> 2H2O
______0,1->0,05
=> mO2 = 0,05.22,4 = 1,12 (l)
Ta có: \(n_{C_4H_{10}}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PT: \(2C_4H_{10}+13O_2\underrightarrow{t^o}8CO_2+10H_2O\)
a, Theo PT: \(n_{O_2}=\dfrac{13}{2}n_{C_4H_{10}}=1,3\left(mol\right)\)
\(\Rightarrow V_{O_2}=1,3.22,4=29,12\left(l\right)\)
b, Theo PT: \(n_{CO_2}=4n_{C_4H_{10}}=0,8\left(mol\right)\)
\(\Rightarrow m_{CO_2}=0,8.44=35,2\left(g\right)\)
c, PT: \(CO_2+2KOH\rightarrow K_2CO_3+H_2O\)
Theo PT: \(n_{K_2CO_3}=n_{CO_2}=0,8\left(mol\right)\)
\(\Rightarrow m_{K_2CO_3}=0,8.138=110,4\left(g\right)\)
2C4H10 + 13O2 = nhiệt độ => 8CO2 + 10H2O
nC4H10= \(\dfrac{4,48}{22,4}\)= 0,2 (mol)
=> nCO2= 5.nC4H10= 5.0,2 = 1 (mol)
=> mCO2= 1.44=44 (g)
nO2=\(\dfrac{13}{2.n_{C4H10}}\)= \(\dfrac{13}{2}\).0,2= 1,3 (mol)
=> VO2= 1,3 . 22,4= 29,12 (l)
$a\big)2Al+6HCl\to 2AlCl_3+3H_2$
$b\big)$
$n_{Al}=\dfrac{5,4}{27}=0,2(mol)$
Theo PT: $n_{H_2}=\dfrac{3}{2}n_{Al}=0,3(mol)$
$\to V_{H_2(đktc)}=0,3.22,4=6,72(l)$
$c\big)$
Theo PT: $n_{AlCl_3}=n_{Al}=0,2(mol)$
$\to m_{AlCl_3}=0,2.133,5=26,7(g)$
a, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
____0,2____________0,2____0,2 (mol)
\(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b, \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
c, \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,2}{1}\), ta được H2 dư.
Theo PT: \(n_{Cu}=n_{CuO}=0,1\left(mol\right)\Rightarrow m_{cr}=m_{Cu}=0,1.64=6,4\left(g\right)\)
1/
\(CaCO_3 + 2HCl \to CaCl_2 + CO_2 +H_2O\\ CO_2 + NaOH \to NaHCO_3 2NaHCO_3 \xrightarrow{t^o} Na_2CO_3 + CO_2 + H_2O\\ Na_2CO_3 + BaCl_2 \to BaCO_3 + 2NaCl\)
1)
\(CaCO_3\underrightarrow{t^o}CO_2+CaO\\ NaOH+CO_2\rightarrow NaHCO_3\\ NaHCO_3+NaOH\rightarrow Na_2CO_3+H_2O\\ Na_2CO_3+Ba\left(OH\right)_2\rightarrow NaOH+BaCO_3\)
2)
\(n_{HCl}=C_{M_{HCl}}.V_{HCl}=1.0,2=0,2\left(mol\right)\)
PTHH: \(K_2CO_3+2HCl\rightarrow2KCl+H_2O+CO_2\)
\(\Rightarrow n_{K_2CO_3}=n_{CO_2}=0,1\left(mol\right)\)
a) \(V_{CO_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)
b) \(m_{K_2CO_3}=0,1.138=13,8\left(g\right)\)
\(m_{ddK_2CO_3}=\dfrac{13,8.100}{13,8}=100\left(g\right)\)