Question

1.
Suppose
you
are
given
5
moles
of
PbS
and
15
moles
of
H2O2.

Calculate
the
maximum
amount of PbSO
4
A 4.5 moles
B) 2.5 moles
C) 3.5 moles
D) 0.5 moles
​

Answer 1

PbS+4H  

2

​  

O  

2

​  

→PbSO  

4

​  

+4H  

2

​  

O

0.04 mol of H  

2

​  

O  

2

​  

 is required to react with 0.01 mol PbS.

Molarity of H  

2

​  

O  

2

​  

 may be calculated as,

Volume strength =Molarity×11.2

10=M×11.2

M=0.892

Number of moles =  

1000

MV

​  

 

0.04=  

1000

0.892×V

​  

 

V=44.8 mL.