A) Tinh số mol của : 28g Fe ; 12,8 g Cu ; 38 g H2O
\(n_{Fe}=\dfrac{m}{M}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(n_{Cu}=\dfrac{m}{M}=\dfrac{12,8}{64}=0,2\left(mol\right)\)
\(n_{H_2O}=\dfrac{m}{M}=\dfrac{38}{18}\sim2,1\left(mol\right)\)
B) Tính thể khí (dktc) của :0,2 mol CO2, 1,75 mol N2
\(V_{CO_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)
\(V_{N_2}=n.22,4=1,75.22,4=39,2\left(l\right)\)
C) Tính khối lượng của : 0,1 mol Zn, 0,8 mol H2SO4
\(m_{Zn}=n.M=0,1.65=6,5\left(g\right)\)
\(m_{H_2SO_4}=n.M=0,8.98=78,4\left(g\right)\)
a)
\(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(n_{Cu}=\dfrac{m_{Cu}}{M_{Cu}}=\dfrac{12,8}{64}=0,2\left(mol\right)\)
\(n_{N2}=\dfrac{m_{H2O}}{M_{H2O}}=\dfrac{38}{18}\approx2,1\left(mol\right)\)
b)
\(V_{CO2}=n_{CO2}.22,4=0,2.22,4=4,48\left(l\right)\)
\(V_{N2}=n_{N2}.22,4=1,75.22,4=39,2\left(l\right)\)
c)
\(m_{Zn}=n_{Zn}.M_{Zn}=0,1.65=6,5\left(g\right)\)
\(m_{H2SO4}=n_{H2SO4}.M_{H2SO4}=0,8.98=78,4\left(g\right)\)