A football at 27 degree Celsius has 0.5 mole of air molecules. Calculate the internal energy of air in the ball
Answers
Answered by
4
Given info : A football at 27 degree Celsius has 0.5 mole of air molecules.
To find : The internal energy of air in the ball is ..
solution : temperature of football, T = 27°C = (27 + 273)K = 300K
no of moles of air molecules in football, n = 0.5
internal energy of ideal gas is given by, U = 3/2 nRT
= 3/2 × 0.5 × 25/3 × 300 K [ value of R = 25/3 J/mol/K]
= 0.25 × 25 × 300 J
= 6.25 × 300 J
= 1875 J
= 1.875 kJ
Therefore the internal energy of air in the ball is 1.875 kJ
Similar questions