Answer : The volume occupied by lead is, 2.20 mL
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
Given :
Mass of an lead = 25.0 grams
Density of lead = 11.34 g/mL
Now put all the given values in the above formula, we get the volume of lead.
Therefore, the volume occupied by lead is, 2.20 mL
Answer : The energy removed must be, -67.7 kJ
Solution :
The process involved in this problem are :
The expression used will be:
where,
= heat released by the reaction = ?
m = mass of benzene = 125 g
= specific heat of gaseous benzene =
= specific heat of liquid benzene =
= enthalpy change for vaporization =
Molar mass of benzene = 78.11 g/mole
Now put all the given values in the above expression, we get:
Therefore, the energy removed must be, -67.7 kJ