First slide

Questions on calorimetry without phase change

Question

Liquids A and Bare at 30°C and 20°C. When mixed in equal masses, the temperature of the mixture is found to be 26°C.Their specific heats are in the ratio of:

Easy

A

3 : 2
B

1 : 1
C

2 : 3
D

4 : 3

Solution

heat lost = Heat gained
$\Rightarrow {ms}_{A} (30 - 26) = {ms}_{B} (26 - 20) \Rightarrow \frac{s_{A}}{s_{B}} = \frac{3}{2}$

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