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a. \(n_{Cu}=\dfrac{28.8}{64}=0,45\left(mol\right)\)
PTHH : CuO + H2 -> Cu + H2O
0,45 0,45 0,45 0,45
\(V_{H_2}=0,45.22,4=10,08\left(l\right)\)
b. \(m_{Cu}=0,45.64=28,8\left(g\right)\)
ncu = 28,8/64 = 0,45 mol
CuO + H2 -> Cu + H2O
1 : 1 : 1 : 1
0,45mol
a) nH2 = (0,45.1) : 1 = 0,45 mol
VH2 = 0,45 . 22,4 = 10,08 ( l )
b) mCu = 0,45 . 64 = 28,8 ( g)
\(n_{Al}=\dfrac{8,1}{27}=0,3mol\)
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
0,3 0,225 0,15 ( mol )
\(V_{O_2}=0,225.22,4=5,04l\)
\(m_{Al_2O_3}=0,15.102=15,3g\)
a) \(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
0,2-->0,25------->0,1
=> \(V_{O_2}=0,25.22,4=5,6\left(l\right)\)
b) \(m_{P_2O_5}=0,1.142=14,2\left(g\right)\)
a.\(n_P=\dfrac{1,55}{31}=0,05\left(mol\right)\)
PTHH : 4P + 5O2 -> 2P2O5
0,05 0,0625 0,025
\(V_{O_2}=0,0625.22,4=1,4\left(l\right)\)
b. \(m_{P_2O_5}=0,025.142=3,55\left(g\right)\)
4P+5O2-to>2P2O5
0,2---0,25-------0,1 mol
n P=\(\dfrac{6,2}{31}\)=0,2 mol
=>VO2=0,25.22,4=5,6l
=>m P2O5=0,1.142=14,2g
c)
2Cu+O2-to>2CuO
0,1---------------0,1
n Cu=\(\dfrac{38,4}{64}\)=0,6 mol
=>Cu dư
=>m CuO=0,1.80=8g
PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
Ta có: \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
\(\Rightarrow n_{O_2}=0,5\left(mol\right)\) \(\Rightarrow V_{O_2}0,5\cdot22,4=11,2\left(l\right)\)
a) \(4P+5O_2\underrightarrow{t\text{°}}P_2O_5\)
b)\(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
Từ PTHH: \(n_{O_2}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\)
\(\Rightarrow\)\(V_{O_2}=0,5.22,4=11,2\left(l\right)\)
\(n_{Cu}=\dfrac{2,56}{64}=0,04mol\)
\(2Cu+O_2\underrightarrow{t^o}2CuO\)
0,04 0,02 0,04
\(V_{O_2}=0,02\cdot22,4=4,48l\)
\(m_{CuO}=0,04\cdot80=3,2g\)
nCu = 2,56 : 64 =0,04 (mol)
pthh : 2Cu + O2 -t--> 2CuO
0,04->0,02----->0,04 (mol)
VO2 = 0,02 .22,4 =0,448 (l)
mCuO = 0,04 . 80 =3,2 (g)