please solve this question 

Asked by shaileshbhagat82816 | 31st Jul, 2018, 07:11: AM

Expert Answer:

1) 
Cu2S  + O2 →  2Cu  + SO2
 
From the above reaction,
1 mole of Cu2S produces 2 moles of copper.
Then 0.6 moles of Cu2S produces 1.2 moles of copper.
 
1 mole of copper is 63.55 g
1.2 moles of copper is 76.26 g.
 
Thus, the mass of copper formed is 76.26 g from 0.6 moles of Cu2S.
 
 
 
2) 
According to stoichiometry,
 
1 mole of Zn will give 2 moles of HCl
 
and, 0.2 mole of Zn is given.
 
Hence, moles of HCl will be 0.2/2=0.1 moles of HCl
 
The number of Moles=wt/mol. wt
 
0.1=wt of HCl/Mol.wt of HCl
 
0.1=wt of HCl/36.5
 
wt of HCl =3.65 g

and,  60% of HCl is=2.19 g
 
We know that,
 
1 mole of gas has 22.4 L Volume
 
Here,
 
According to stoichiometry,
 
1 mole of Zn will give 1 mole of H2
 
Hence, 2 moles of H2
 
means, 0.2 X 22.4 L=4.48 L of H2 
 
 

Answered by Ramandeep | 31st Jul, 2018, 10:15: AM