First slide

Calorimetry

Question

A student takes 50gm wax (specific heat = 0.6 kcal/kg^oC) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are, respectively

Moderate

A

$500 cal, 50^{\circ} C$
B

$1000 cal, 100^{\circ} C$
C

$1500 cal, 200^{\circ} C$
D

$1000 cal, 200^{\circ} C$

Solution

Since specific heat $= 0.6 kcal / gm \times^{\circ} C$
$= 0.6 cal / gm \times^{\circ} C$
From graph it is clear that in a minute, the temperature is raised from $0^{\circ} C to 50^{\circ} C .$
$\Rightarrow$ Heat required for a minute $= 50 \times 0.6 \times 50 = 1500 cal$
Also from graph, Boiling point of wax is 200^oC.

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