Specific heat capacity of water is
A=9R
B=8R
C=7/8R
D=9/7R
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Specific heat capacity of water is
A=9R
When we try to calculate the specific heat capacity of water, we treat water as a solid.
Average K.E. for each atom, as we know is equal to 3KbT, where Kb is Boltzmans Constant and T is the temperature.
As water consists of 3 atoms (2 of H and 1 of O)
So, for 3 atoms, total energy of 1 mole of water
Energy = 3 × 3KbT × Na
Na is Avogadros No.
Energy = (9 × R × Na × T)/ Na [As Kb = R/Na, R is universal gas constant.]
= 9RT
Heat capacity per mole of water is = (Energy/T) = 9RT/T = 9R
Option (A) is correct.
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