
(a)
Interpretation:
The sample which will have higher temperature after 5 min needs to be determined from 50 g methanol and 50 g water kept in two 100 mL beaker placed on a hot plate.
Concept Introduction:
Heat absorbed by any sample H
(a)

Answer to Problem 8E
Methanol sample will have higher temperature.
Explanation of Solution
Specific heat (s) of water is greater than that of methanol.
So, when mass of the water and methanol sample (m) is same and same heat (H) is provided by the hot plate then methanol will have more temperature rise as it has lesser specific heat (s).
b)
Interpretation:
Final temperature for methanol and water must be found when initial temperature is 23°C and 25 cal heat energy is provided by the hot plate.
Concept Introduction:
Relation of heat (H) and temperature change (t) can be given by
b)

Answer to Problem 8E
Temperature of water will be 23.5°C and temperature of methanol will be 23.83°C.
Explanation of Solution
For water
So final temperature
For methanol,
So final temperature
Chapter U5 Solutions
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