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4.
a) \(V_{SO_2}=0.5\cdot22.4=11.2\left(l\right)\)
b) \(V_{CH_4}=\dfrac{3.2}{16}\cdot22.4=4.48\left(l\right)\)
c) \(V_{N_2}=\dfrac{0.9\cdot10^{23}}{6\cdot10^{23}}\cdot22.4=3.36\left(l\right)\)
5.
a) \(m_{Al}=0.1\cdot27=2.7\left(g\right)\)
b) \(m_{Cu\left(NO_3\right)_2}=0.3\cdot188=56.4\left(g\right)\)
c) \(m_{Na_2CO_3}=\dfrac{1.2\cdot10^{23}}{6\cdot10^{23}}\cdot106=21.2\left(g\right)\)
d) \(m_{CO_2}=\dfrac{8.96}{22.4}\cdot44=17.6\left(g\right)\)
e) \(m_K=0.5\cdot2\cdot39=39\left(g\right)\\ m_C=0.5\cdot12=6\left(g\right)\\ m_O=0.5\cdot3\cdot16=24\left(g\right)\)
a) mBr = 1.80 = 80 (g)
b) mC6H12O6 = 1.180=180(g)
c) mFe3O4 = 1.232= 2332(g)
\(a.m_{Br}=1.80=80\left(g\right)\\ b.m_{C_6H_{12}O_6}=1.180=180\left(g\right)\\ c.m_{Fe_3O_4}=\dfrac{N}{6.10^{23}}.232\left(g\right)\)
\(a.m_{CuSO_4}=n.M=0,3.160=48\left(g\right)\)
\(b.n_{CaCO_3}=\dfrac{9.10^{23}}{6.10^{23}}=1,5\left(mol\right)\\ m_{CaCO_3}=n.M=1,5.100=150\left(g\right)\)
\(c.n_{MgCl_2}=\dfrac{1,5.10^{22}}{6.10^{23}}=0,025\left(mol\right)\\ \Rightarrow m_{MgCl_2}=n.M=0,025.95=2,375\left(g\right)\)
a) mCuSO4 = 0,3.160 = 48(g)
b) \(n_{CaCO_3}=\dfrac{9.10^{23}}{6.10^{23}}=1,5\left(mol\right)\)
=> mCaCO3 = 1,5.100 = 150(g)
c) \(n_{MgCl2}=\dfrac{1,5.10^{22}}{6.10^{23}}=0,025\left(mol\right)\)
=> mMgCl2 = 0,025.95 = 2,375(g)
Câu a.
\(M_{Ca\left(NO_3\right)_2}=164\)g/mol
\(m_{Ca\left(NO_3\right)_2}=0,3\cdot164=49,2g\)
\(\%Ca=\dfrac{40}{164}\cdot100\%=24,39\%\)
\(m_{Ca}=\%Ca\cdot49,2=12g\)
\(\%N=\dfrac{14\cdot2}{164}\cdot100\%=17,07\%\)
\(m_N=\%N\cdot49,2=8,4g\)
\(m_O=49,2-12-8,4=28,8g\)
Các câu sau em làm tương tự nhé!
a)\(n_{Ca\left(NO_3\right)_2}=0,3mol\)
\(n_{Ca}=n_{Ca\left(NO_3\right)_2}=0,3mol\)
\(m_{Ca}=0,3\cdot40=12g\)
\(n_N=2n_{Ca\left(NO_3\right)_2}=2\cdot0,3=0,6mol\)
\(m_N=0,6\cdot14=8,4g\)
\(n_O=6n_{Ca\left(NO_3\right)_2}=6\cdot0,3=1,8mol\)
\(m_O=1,8\cdot16=28,8g\)
b)\(n_O=\dfrac{9,6}{16}=0,6mol\)
Mà \(n_O=12n_{Fe_2\left(SO_4\right)_3}\Rightarrow n_{Fe_2\left(SO_4\right)_3}=\dfrac{0,6}{12}=0,05mol\)
\(\Rightarrow m=20g\)
c)\(n_{CuSO_4}=\dfrac{3,2}{160}=0,02mol\)
\(n_O=4n_{CuSO_4}=0,08mol=n_{H_2}\)
\(V_{H_2}=0,08\cdot22,4=1,792l\)
a) \(m_{H_2SO_4}=0,35.98=34,3\left(g\right)\)
b) \(m_{Na_2CO_3}=\dfrac{5,4.10^{23}}{6.10^{23}}.106=95,4\left(g\right)\)
c) \(m_{Ca\left(NO_3\right)_2}=\dfrac{2,4.10^{23}}{6.10^{23}}.164=65,6\left(g\right)\)
a) \(m_{H_2SO_4}=98.0,35=34,3\left(g\right)\)
b) \(n_{Na_2CO_3}=\dfrac{5,4.10^{23}}{6.10^{23}}=0,9\left(mol\right)\)
=> \(m_{Na_2CO_3}=106.0,9=95,4\left(g\right)\)
c) \(n_{Ca\left(NO_3\right)_2}=\dfrac{2,4.10^{23}}{6.10^{23}}=0,4\left(mol\right)\\ m_{Ca\left(NO_3\right)_2}=0,4.164=65,6\left(g\right)\)