Question

What is the amount of heat 1 kg of ice from `-5^(@)C" to "5^(@)C` (Given, specific heat of ice `=2.095 Kj kg^(1)""^(@)C^(-1)`, specific heat of water `=4.2 J g^(-1)""^(@)C^(-1),` specifc latent heat of fusion of ice `=336 J g^(-1)`)

Answer 1

(i) Find the total amount heat required convert 1 kg of ice at `0^(@)C` to water at `100^(@)C`
`Q_(1)=m_(i)L_(F)+m_(i)S_(W)(DeltaT)=mL_(F)+mS_(W)(100)" (1)"`
Find the amount of steam that gets condensed into water `100^(@)C`
Consider the efficiency of the calorimeter as 90%
`rArr" Then ",(90)/(100)(m_(S)L_(V))=Q_(1)" (2)"`
Find the value of `m_(S)` from (2).
Find the ratio of `(m_(s))/(m_(W))`.
Heat last to the surroundings is `=(1)/(10)m_(s)L_(V).`
(ii) `0.49,84 kJ`