Question

An ice cube of mass 0.1 kg at `0^@C` is placed in an isolated container which is at `227^@C`. The specific heat s of the container varies with temperature T according to the empirical relation `s=A+BT`, where `A= 100 cal//kg.K and B = 2xx 10^-2 cal//kg.K^2`. If the final temperature of the container is `27^@C`, determine the mass of the container.
(Latent heat of fusion for water = `8xx 10^4 cal//kg`, specific heat of water `=10^3 cal//kg.K`).
A. `0.495 kg`
B. `0.595 kg`
C. `0.695 kg`
D. `0.795 kg`

Answer 1

Correct Answer - A
Heat lost by container `= iint_(500)^(300) m_(C)(A + BT) dT`
`= - m_(C) [At + (BT^(2))/(2)]_(500)^(300) = 21600 m_(C)`
Heat gained by ice `= m_(ice) L + m_(ice)s_("water")DeltaT`
`= 0.1 xx 8 xx 10^(4) + 0.1 xx 10^(3) xx 27`
`= 10700 cal`
According to principal of calorimetry
Heat lost by container = Heat gained by ice
`21600 m_(C) = 10700`
or `m _(C) = 0.495` kg