Question
Question: An electrically heating coil is placed in a calorimeter containing 360 g of H<sub>2</sub>O at 10<sup...
An electrically heating coil is placed in a calorimeter containing 360 g of H2O at 100C. The coil consumes energy at the rate of 90 W. The water equivalent of calorimeter and the coil is 40g. The temperature of water after
10 minutes will be –
A
42.140C
B
32.14 0C
C
22.14 0C
D
52.14 0C
Answer
42.140C
Explanation
Solution
Q = P.t = (m + w) CDT
Ž 4.290×600 = (360 + 40) DT Ž DT = 32.14 0C
\ T = 10 + 32.14 = 92.14