please solve this question 

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