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10-1.Thermometry, Thermal Expansion and Calorimetry
medium
$10 \,\,gm$ of ice at $0^o C$ is kept in a calorimeter of water equivalent $10 \,\,gm$. ....... $cal$ heat should be supplied to the apparatus to evaporate the water thus formed? (Neglect loss of heat)
A
$6200 $
B
$7200$
C
$13600$
D
$8200 $
Solution
Heat supplied to ice to change from $0^{\circ} \mathrm{C}$ ice to $100^{\circ} \mathrm{C}$ vapour is
$M L_{f u s i o n}+M C \Delta T+M L_{v a p}$
$Q_{1}=10 \times 336+10 \times 4.2 \times 100+10 \times 2260$
$Q_{1}=30160 \mathrm{J}$ or $7200 \mathrm{cal}$
Heat for calorimeter $Q_{2}=10 \times 1 \times 100=1000 \mathrm{cal}$
$Q=Q_{1}+Q_{2}=8200 \mathrm{cal}$
Standard 11
Physics
