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\(n_{SO_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ m_{SO_2}=n\cdot M=0,1\cdot\left(32+16\cdot2\right)=6,4\left(g\right)\)
\(n_{O_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ m_{O_2}=n\cdot M=0,05\cdot32=1,6\left(g\right)\)
\(=>m_{hh}=1,6+6,4=8\left(g\right)\)
\(n_{SO_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ \Rightarrow m_{SO_2}=n.M=0,1.64=6,4\left(g\right)\\ n_{O_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ \Rightarrow m_{O_2}=n.M=0,05.32=1,6\left(g\right)\\ \Rightarrow m_{hh}=m_{SO_2}+m_{O_2}=6,4+1,6=8\left(g\right)\)
a, khối lượng của 2,5 mol CuO là:
\(m=n.M=2,5.80=200\left(g\right)\)
b, số mol của 4,48 lít khí CO2 (đktc) là:
\(n=\dfrac{V}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
mhh=\(\dfrac{3,36}{22,4}.64+\dfrac{2,8}{22,4}.28+\dfrac{6,72}{22,4}.2=13,7gam\)
=> ý A
a.
\(m_{Al}=0.5\cdot27=13.5\left(g\right)\)
\(m_{CO_2}=\dfrac{6.72}{22.4}\cdot44=13.2\left(g\right)\)
\(m_{N_2}=\dfrac{5.6}{22.4}\cdot28=7\left(g\right)\)
\(m_{CaCO_3}=0.25\cdot100=25\left(g\right)\)
b.
\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)
Gọi số mol CH4, O2 là a, b (mol)
=> \(\left\{{}\begin{matrix}a+b=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\\overline{M}=\dfrac{16a+32b}{a+b}=0,4375.64=28\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}a=0,025\\b=0,075\end{matrix}\right.\)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
Xét tỉ lệ: \(\dfrac{0,025}{1}< \dfrac{0,075}{2}\) => CH4 hết, O2 dư
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
0,025->0,05----->0,025
=> \(\left\{{}\begin{matrix}n_{CO_2}=0,025\left(mol\right)\\n_{O_2\left(dư\right)}=0,075-0,05=0,025\left(mol\right)\end{matrix}\right.\)
=> \(\%V_{CO_2}=\%V_{O_2\left(dư\right)}=\dfrac{0,025}{0,025+0,025}.100\%=50\%\)
\(n_{hh}=\dfrac{13,44}{22,4}=0,6mol\)
\(\overline{M_x}=24.2=48\)
\(\left\{{}\begin{matrix}SO_2:64\\O_2:32\end{matrix}\right.\) 48 = \(\dfrac{16}{16}=1\)
\(\Rightarrow n_{SO_2=}n_{O_2}=0,3mol\)
1. \(m_{hh}=0,3.64+0,3.32=28,8g\)
2. \(\%V_{SO_2}=\dfrac{0,3.22,4}{13,44}.100\%=50\%\)
\(\Rightarrow\%V_{O_2}=50\%\)
3. \(m_{SO_2}=0,3.64=19,2g\)
\(m_{O_2}=0,3.32=9,6g\)
\(n_{SO_2}=\frac{V_{SO_2}}{22,4}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(=>m_{SO_2}=n_{SO_2}.M_{SO_2}=0,1.64=6,4\left(g\right)\)
\(n_{O_2}=\frac{V_{O_2}}{22,4}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(=>m_{O_2}=n_{O_2}.M_{O_2}=0,15.32=4,8\left(g\right)\)
Cam on ban nhiu nka