In: Chemistry
The heat capacity of an object indicates how much energy that object can absorb for a given increase in that object's temperature. In a system in which two objects of different temperatures come into contact with one another, the warmer object will cool and the cooler object will warm up until the system is at a single equilibrium temperature.
Note the difference between the terms molar heat capacity, which has units of J/(mol⋅∘C), and specific heat, which has units of J/(g⋅∘C).
Part B
The specific heat of water is 4.18 J/(g⋅∘C). Calculate the molar heat capacity of water.
Express your answer to three significant figures and include the appropriate units.
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molar heat capacity for water = |
The specific heat has units of J per gram C whereas molar heat capacity is J per mole C.
Now as we know the molar mass of water = 18.02 g/ mol
So the molar heat capacity of water = 4.18 x 18.02
= 75.3 J/mol oC