Answer: 
Explanation:
Volume of metal = volume of water displaced = (30.0 - 25.0) ml = 5.0 ml
Density of metal = 5.50 g/ml
Mass of metal =
Volume of water = 25.0 ml
Density of metal = 1.0 g/ml
Mass of metal =

As we know that,

.................(1)
where,
q = heat absorbed or released
= mass of metal = 27.5 g
= mass of water = 25.0 g
= final temperature = ?
= temperature of metal = 
= temperature of water = 
= specific heat of lead = ?
= specific heat of water= 
Now put all the given values in equation (1), we get
![27.5g\times c_1\times (41.0-153)^0C=[25.0g\times 4.814J/g^0C\times (41.0-25.0)^0C]](https://tex.z-dn.net/?f=27.5g%5Ctimes%20c_1%5Ctimes%20%2841.0-153%29%5E0C%3D%5B25.0g%5Ctimes%204.814J%2Fg%5E0C%5Ctimes%20%2841.0-25.0%29%5E0C%5D)

Thus the specific heat of the unknown metal sample is 