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Bài này bạn viết phương trình rồi tính số mol các chất cho sẵn => Tính số mol chất yêu cầu ( oxi ) => Rồi tính khối lượng oxi cần dùng thôi bạn...
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Chép có mà mỏi tay:https://hoc24.vn/hoi-dap/tim-kiem?q=t%C3%ADnh+l%C6%B0%E1%BB%A3ng+kh%C3%AD+oxi+c%E1%BA%A7n+d%C3%B9ng+%C4%91%E1%BB%83+%C4%91%E1%BB%91t+ch%C3%A1y+h%E1%BA%BFt++a/+46,5g+photpho++b/+67,5g+nh%C3%B4m++c/+30g+cacbon++d/+33,6+l+kh%C3%AD+hidro&id=177388
a) nP= 46,5/31= 1,5(mol)
PTHH: 4 P + 5 O2 -to-> 2 P2O5
1,5________1,875(mol)
=>mO2= 1,875.32= 60(g)
b) nAl= 67,5/27= 2,5(mol)
PTHH: 4 Al +3 O2 -to-> 2 Al2O3
2,5______1,875(mol)
=> mO2= 1,875.32= 60(g)
c) nH2 = 33,6/22,4= 1,5(mol)
PTHH: H2 + 1/2 O2 -to-> H2O
1,5________0,75(mol)
=> mO2= 0,75.32= 24(g)
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a) \(n_P=\dfrac{46,5}{31}=1,5\left(mol\right)\)
\(4P+5O_2\rightarrow2P_2O_5\)
1,5.....1,875 (mol)
\(\rightarrow m_{O_2}=1,875.32=60\left(g\right)\)
c. \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(2H_2+O_2\rightarrow2H_2O\)
0,15.....0,075 (mol)
\(\rightarrow m_{O_2}=0,075.32=2,4\left(g\right)\)
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a, \(PTHH:4P+5O_2\rightarrow2P_2O_5\)
\(n_P=\frac{46,5}{31}=1,5\left(mol\right)\)
\(\Rightarrow n_{O2}=1,875\left(mol\right)\)
\(\Rightarrow V_{O2}=1,875.22,4=42\left(l\right)\)
\(\Rightarrow V_{kk}=42.5=210\left(l\right)\)
b,\(PTHH:C+O_2\rightarrow CO_2\)
\(n_C=\frac{30}{12}=2,5\left(mol\right)\)
\(\Rightarrow n_{O2}=n_C=2,5\left(mol\right)\)
\(\Rightarrow V_{O2}=2,5.22,4=56\left(l\right)\)
\(\Rightarrow V_{kk}=56.5=280\left(l\right)\)
c,\(PTHH:4Al+3O_2\rightarrow2Al_2O_3\)
\(n_{Al}=\frac{67,5}{27}=2,5\left(mol\right)\)
\(\Rightarrow n_{O2}=1,875\left(mol\right)\)
\(\Rightarrow V_{O2}=1,875.22,4=42\left(l\right)\)
\(\Rightarrow V_{kk}=42.5=210\left(l\right)\)
d,\(PTHH:2H_2+O_2\rightarrow2H_2O\)
\(n_{H2}=\frac{33,6}{22,4}=1,5\left(mol\right)\)
\(\Rightarrow n_{O2}=0,75\left(mol\right)\)
\(\Rightarrow V_{O2}=0,75.22,4=16,8\left(l\right)\)
\(\Rightarrow V_{kk}=16,8.5=84\left(l\right)\)
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Bài 1:
\(n_{C_4H_{10}}=\frac{m}{M}=\frac{11,6}{58}=0,2mol\)
PTHH: \(2C_4H_{10}+13O_2\rightarrow^{t^o}8CO_2\uparrow+10H_2O\)
0,2 1,3 0,8 1 mol
\(\rightarrow n_{O_2}=n_{C_4H_{10}}=\frac{13.0,2}{2}=1,3mol\)
\(V_{O_2\left(ĐKTC\right)}=n.22,4=1,3.22,4=29,12l\)
\(\rightarrow n_{CO_2}=n_{C_4H_{10}}=\frac{8.0,2}{2}=0,8mol\)
\(m_{CO_2}=n.M=0,8.44=35,2g\)
\(\rightarrow n_{H_2O}=n_{C_4H_{10}}=\frac{10.0,2}{2}=1mol\)
\(m_{H_2O}=n.M=1.18=18g\)
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a) PTPU: \(4P+5O_2\rightarrow2P_2O_5\)
\(nP=\frac{6,2}{31}=0,2mol\)
\(n_{O_2}=\frac{7,84}{22,4}=0,35mol\)
\(n_{O_2}\) (Tính theo P) \(=\frac{0,2.5}{4}=0,25mol\)
\(\rightarrow O_2\) dư
\(\rightarrow n_{O_2\text{(dư)}}=0,35-0,35=0,1mol\)
\(\rightarrow m_{O_2\text{(dư)}}=0,1.32=3,2g\)
b) \(m_{O_2\text{(phản ứng)}}=0,25.32=8g\)
Theo ĐLBTKL: \(mP+m_{O_2}=m_{P_2O_5}\rightarrow m_{P_2O_5}=6,2+8=14,2g\)
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\(HgO\left(0,1\right)+H_2\left(0,1\right)\rightarrow Hg\left(0,1\right)+H_2O\)
Ta có: \(n_{HgO}=\dfrac{21,7}{217}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Hg}=0,1.201=20,1\left(g\right)\\m_{H_2}=0,1.2=0,2\left(g\right)\end{matrix}\right.\)
a. Số mol thủy ngân (II) oxit là: n = =
= 0,1 (mol)
phương trình phản ứng:
HgO + H2 → H2O + Hg
1 mol 1 mol 1mol 1 mol
0,1 0,1 0,1 0,1
Khối lượng thủy ngân thu được: m = 0,1.201 = 20,1 (g)
b. Số mol khí hi đro: n = 0,1 mol
Thể tích khí hiđro cần dùng ở đktc là:
V = 22,4.0,1 = 2,24 (lít)
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a) S+O2--->SO2
a) Ta có
n SO2=19,2/64=0,3(mol)
n O2=15/32=0,46875(mol)
-->O2 dư
Theo pthh
nS=n SO2=0,3(mol)
m S=0,3.32=9,6(g)
b) n O2=n SO2=0,3(mol)
n O2 dư=0,46875-0,3=0,16875(mol)
m O2 dư=0,16875.32=5,4(g)
Chúc bạn học tốt :))
a) n P=46,5/31=1,5(mol)
4P+5O2-->2P2O5
1,5---1,875
m O2=1,875.32=60(g)
b) n C=30/12=2,5(g)
C+O2--->CO2
2,5--2,5
m O2=2,5.32=80(g)
c) m Al=67,5/27=2,5(mol)
4Al+3O2--->2Al2O3
2,5----1,875(mol)
m O2=0,1875.32=60(g)
d) n H2=33,6/22,4=1,5(mol)
2H2+O2-->2H2O
1,5-----0,75(mol)
m O2=0,75.32=24(g)
Chúc bạn học tốt :))
a)
nP= 46,5/31 = 1,5(mol)
4P + 5O2 --> 2P2O5
m O2=1,875.32=60(g)
b)
nC= 30/12 = 2,5(mol)
C + O2 -->CO2
mO2=2,5.32= 80 (g)
c)
nAl= 67,5/27=2,5 (mol)
4Al + 3O2 --> 2Al2O3
mO2= 0,1875.32 =60 (g)
d) nH2=33,6/22,4=1,5(mol)
2H2 + O2 --> 2H2O
mO2=0,75.32=24(g)