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a) mFeSO4= 0,25.152=38(g)
b) mFeSO4= \(\dfrac{13,2.10^{23}}{6.10^{23}}.152=334,4\left(g\right)\)
c) mNO2= \(\dfrac{8,96}{22,4}.46=18,4\left(g\right)\)
d) mA= 27.0,22+64.0,25=21,94(g)
e) mB= \(\dfrac{11,2}{22,4}.32+\dfrac{13,44}{22,4}.28=32,8\left(g\right)\)
g) mC= \(64.0,25+\dfrac{15.10^{23}}{6.10^{23}}.56=156\left(g\right)\)
h) mD= \(0,25.32+\dfrac{11,2}{22,4}.44+\dfrac{2,7.10^{23}}{6.10^{23}}.28=42,6\left(g\right)\)
hơi muộn nha<3
\(a.\overline{M}_A=\dfrac{n_{O_2}\cdot M_{O_2}+n_{N_2}\cdot M_{N_2}+n_{CO_2}\cdot M_{CO_2}+n_{H_2}\cdot M_{H_2}}{n_{O_2}+n_{N_2}+n_{CO_2}+n_{H_2}}\\ =\dfrac{0,2\cdot32+0,1\cdot28+0,05\cdot44+0,15\cdot2}{0,2+0,1+0,05+0,15}\\ =\dfrac{11,7}{0,5}=23,4\left(g/mol\right)\)
b) \(d_{hh/CH_4}=\dfrac{23,4}{16}=1,4625\)
a/ Ta có: VO2(đktc) = 0,25 x 22,4 = 5,6 lít
b/ Ta có: VH2(đktc) = 0,6 x 22,4 = 13,44 lít
c/ Ta có:
- nCO2 = 4,4 / 44 = 0,1 (mol)
- nN2 = 22,8 / 28 \(\approx0,81\left(mol\right)\)
=> Vhỗn hợp khí(đktc) = ( 0,1 + 0,15 + 0,81 ) x 22,4 = 23,744 (lít)
a.VO2=n.22,4=0,25.22,4=5,6l
b.VH2=n.22,4=0,6.22,4=13,44l
c.nCO2=m:M=4,4:44=0,1mol
nN2=m:M=22,8:28=0,8mol
Vhh=(0,1.22,4)+(0,15.22,4)+(0,8.22,4)=23,52l
Ta có :
\(m_x=m_{CO_2}+m_{O_2}=44.0,15+32.0,1=9,8\) gam
\(n_x=n_{CO_2}+n_{O_2}=0,15+0,1=0,25\) mol
\(\Rightarrow\overline{M_x}=\frac{m_x}{n_x}=\frac{9,8}{0,25}=39,2\) gam/mol
\(\Rightarrow d_{\frac{x}{kk}}=\frac{\overline{M_x}}{29}=\frac{39,2}{29}=1,35\)
\(c.\overline{M_X}=\dfrac{m_{O_2}+m_{H_2}+m_{CO_2}+m_{CH_4}}{n_{O_2}+n_{H_2}+n_{CO_2}+n_{CH_4}}\\ =\dfrac{0,8.32+1.2+0,2.44+2.16}{0,8+1+0,2+2}\\ =17,1\left(\dfrac{g}{mol}\right)\)
\(d)\)dX/H2 = \(\dfrac{M_X}{2}=\dfrac{17,1}{2}=8,55\)
Bài 1 :
Ta có
Số phân tử NaOH gấp đôi số phân tử HCl
\(\Rightarrow n_{NaOH}=2n_{HCl}=\frac{2.7,3}{36,5}=0,4\left(mol\right)\)
\(m_{NaOH}=0,4.23=9,2\left(g\right)\)
Bài 2 :
\(n_{CH4}=2\left(mol\right)\)
\(\Rightarrow n_H=2.4=8\left(mol\right)\)
\(\%m_H=\frac{4}{16}.100\%=5\%\)
Bài 3 :
\(d_{A/B}=\frac{M_A}{M_B}\)
\(d_{A/kk}=\frac{M_A}{M_{kk}}=\frac{M_A}{29}\)
Bài 4 :
a. \(d_{CO2/N2}=\frac{28}{28}=1\)
b. \(d_{CO2/O2}=\frac{44}{32}=1,375\)
c. \(d_{N2/H2}=\frac{28}{2}=14\)
d. \(d_{CO2/N2}=\frac{44}{28}=1,57\)
e. \(d_{H2S/H2}=\frac{32}{2}=17\)
f. \(d_{CO/H2S}=\frac{28}{34}=0,824\)
Bài 5 :
\(d_{N2/kk}=\frac{28}{29}=0,9\)
\(d_{CO2/kk}=\frac{44}{29}=1,5\)
\(d_{CO/kk}=\frac{30}{29}=1,03\)
\(d_{C2H2/29}=\frac{26}{29}=0,8\)
\(d_{C2H4/kk}=\frac{28}{29}=0,9\)
\(d_{Cl2/kk}=2,44\)
Bài 6 :
d, \(d_{H2S/H2}=17\)
\(d_{O2/H2}=8,1\)
\(d_{C2H2/H2}=14\)
\(d_{Cl2/H2}=35,5\)
b,\(d_{H2S/kk}=1,1\)
\(d_{O2/kk}=0,5\)
\(d_{C2H2/kk}=0,9\)
\(d_{Cl2/kk}=2,4\)
đối vs không khí:
Ta có dA/kk=(0,25.32+0,05.44+0,1.28)/(0,25+0,05+0,1):29=1,12
dB/kk=(7+2,8+4+22)/(7/28+ 2,8/28+ 4/16+22/44):29=0,8139
dA/H2=(0,25.32+0,05.44+0,1.28)/(0,25+0,05+0,1):2=16,25
dB/H2=(7+2,8+4+22)/(7/28+ 2,8/28+ 4/16+22/44):2=11,802