First slide

Questions on calorimetry without phase change

Question

An electrically heated coil is immersed in a calorimeter containing 360 gm of water at $10^{0}$ C. The coil consumes energy at the rate of 90W. The water equivalent of the calorimeter and coil is 40 gm. The temperature of water after 10 min is

Moderate

A

$4 . 214^{0} C$
B

42.14 $^{0} C$
C

$30^{0} C$
D

23 $^{0} C$

Solution

$e n e r g y g i v e n b y h e a t e r = P \times t = 90 \times 10 \times 60 J$
$h e a t a b s o r b e d b y w a t e r a n d c a l o r i m e t e r s y s t e m i s = (M + M_{c}) S_{w} (t - 10)$
$90 \times 60 \times 10 = 400 \times 10^{- 3} \times 4200 (t - 10)$
t= 42.14 ${}^{0}C$

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