Question 426: Properties of Matter

Question

A liquid at 30$$^\circ $$C is poured very slowly into a Calorimeter that is at temperature of 110$$^\circ $$C. The boiling temperature of the liquid is 80$$^\circ $$C. It is found that the first 5 gm of the liquid completely evaporates. After pouring another 80 gm of the liquid the equilibrium temperature is found to be 50$$^\circ $$C. The ratio of the latent heat of the liquid to its specific heat will be ...........$$^\circ $$C.
[Neglect the heat exchange with surrounding]

Accepted Answer

Case - I 5C $$ 	imes $$ 50 + 5L = C
2
$$ 	imes $$ 30 ....(i)
Case - II 80C[50$$ - $$30] = C
2
[80$$ - $$50] ....(ii)
By Eq. (i) and (ii)
1600C = 250 + 5L
$$ 	herefore $$ $${L \over C} = {{1350} \over 5} = 270^\circ C$$

Properties of Matter

Integer / Numeric Answer Type