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\(a,n_{C_{12}H_{22}O_{11}}=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2(mol)\\ m_{C_{12}H_{22}O_{11}}=0,2.342=68,4(g)\\ b,n_{C}=0,2.12=2,4(mol)\Rightarrow m_{C}=2,4.12=28,8(g)\\ n_{H}=0,2.22=4,4(mol)\Rightarrow m_H=4,4.1=4,4(g)\\ n_{O}=0,2.11=2,2(mol)\Rightarrow m_O=2,2.16=35,2(g)\)
\(a.n_{Ba_3\left(PO_4\right)_2}=\dfrac{120,2}{601}=0,2\left(mol\right)\\ b.Sốphântử:3+\left(1+4\right).2=13\left(phântử\right)\\ c.n_{Ba}=3n_{Ba_3\left(PO_4\right)_2}=0,6\left(mol\right)\\ \Rightarrow m_{Ba}=82,2\left(g\right)\\ n_P=2n_{Ba_3\left(PO_4\right)_2}=0,4\left(mol\right)\\ \Rightarrow m_P=0,4.31=12,4\left(g\right)\\ n_O=8n_{Ba_3\left(PO_4\right)_2}=1,6\left(mol\right)\\ \Rightarrow m_O=1,6.16=25,6\left(g\right)\)
a)
\(m_C=\dfrac{52,15.46}{100}=24\left(g\right)=>n_C=\dfrac{24}{12}=2\left(mol\right)\)
\(m_H=\dfrac{13,04.46}{100}=6\left(g\right)=>n_H=\dfrac{6}{1}=6\left(mol\right)\)
\(m_O=46-24-6=16\left(g\right)=>n_O=\dfrac{16}{16}=1\left(mol\right)\)
=> CTHH: C2H6O
b) \(n_A=\dfrac{18,4}{46}=0,4\left(mol\right)\)
mC = 12.0,4.2 = 9,6(g)
mH = 1.0,4.6 = 2,4 (g)
mO = 16.0,4.1 = 6,4 (g)
c) \(n_A=\dfrac{13,8}{46}=0,3\left(mol\right)\)
Số nguyên tử C = 2.0,3.6.1023 = 3,6.1023
Số nguyên tử H = 6.0,3.6.1023 = 10,8.1023
Số nguyên tử O = 1.0,3.6.1023 = 1,8.1023
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, Số mol phân tử C12H22O11 là:
\(n=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2\left(mol\right)\)
khối lượng phân tử C12H22O11 là:
\(m=0,2.342=68,4\left(g\right)\)