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ICSE Class 10 Answered

In our book, L=Q/m and Q=mc∆t are given then why and how have you written Q=mc∆t+mL?? In calorimetry,  Ex B numerical no. 1
Asked by chaitalisen977 | 19 May, 2020, 03:32: PM
Expert Answer
While solving such kind of problems based on change of phase of substance (Like in this case the ice (solid state) is converting to water(liquid state)) we have to consider the amount of heat energy required to raise the temperature of water which is at temperature 0°C to 50º C (as per the given problem) and also the heat energy required or exchanged while change of phase 
 
Hence, as per the numerical, 
Amount of heat energy required by 10g (0.01kg) of water at 0oC to raise its temperature by 50oC, Q1 = mΔct =0.01 X 4200 X 50=2100J
and 
Amount of heat required to change the phase from ice to water, Q2 = mL 
 
Hence, 
 
Q = Q1 + Q2 
Thus, 
Q = mΔct + mL 
 
 
Solve more problems based on this concept. This will help you to understand the concept easily. 
Answered by Shiwani Sawant | 19 May, 2020, 05:44: PM

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