Question

hãy tìm thể tích khí ở đktc :

A.0,2 mol CO2 ;0,25 mol O2

B.21g N2 ,8,8 g CO2 

C.9.10 MŨ 23 phân tử  H2 ;0,3 .10 mũ 23 phân tử CO 

Answer 1

A

\(V_{CO_2}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\\ n_{O_2}=n\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\)

B

\(n_{N_2}=\dfrac{m}{M}=\dfrac{21}{14\cdot2}=0,75\left(mol\right)\\ V_{N_2}=n\cdot22,4=0,75\cdot22,4=16,8\left(l\right)\)

 

\(n_{CO_2}=\dfrac{m}{M}=\dfrac{8,8}{12+16\cdot2}=0,2\left(mol\right)\\ V_{CO_2}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\)

C

\(n_{H_2}=\dfrac{9\cdot10^{23}}{6\cdot10^{23}}=1,5\left(mol\right)\\ V_{H_2}=n\cdot22,4=1,5\cdot22,4=33,6\left(l\right)\)

 

\(n_{CO_2}=\dfrac{0,3\cdot10^{23}}{6\cdot10^{23}}=0,05\left(mol\right)\\ V_{CO_2}=n\cdot22,4=0,05\cdot22,4=1,12\left(l\right)\)