Molecular Physics | Thermodynamics Answers

El pH de una solución de 0.02 M de un ácido débil desconocido es 3.7. ¿cuál es el pKa de este ácido?

A body start from rest and moves uniformly or accelerate uniformly at 20m/sec for 4sec .it then continues with this velocity for another 10sec before it is uniformly brought to rest in a further 5sec .draw the velocity time graph for the motion or the body and find its acceleration and find its retadiation and distance travelled during the uniform velocity and total distance travelled

A medallion made of nickel (coefficient of linear expansion = 1.5 x 10^-5/K) has a diameter of 0.1m at 20^oC. What will be its diameter at 35^oC?

A tall unclothed athlete with a skin temperature of 34^oC stands in a dark room with a temperature o 23^oC. The athlete’s skin has a surface area of 1.7m². What is the rate of heat transfer via radiation from the athlete? (e_skin  = 0.97)

A glass container ( k=1.05 W/m-K) with a surface area 0.3m² is filled with hot water at 100^oC and was let to cool in a room with a temperature of 27^oC. If the walls of the container are 0.8cm thick, how much heat is transferred from inside the glass to the room per second?

For a reaction of conversion of ATP into ADP at 20⁰C, calculate the reaction Gibbs free energy. Given the change in enthalpy is 20.27 Kcal and the change in entropy is 85 cal/Kelvin

For a reaction glutamate + NH3 → glutamine + H2O that occurred at 20⁰C, calculate the Gibbs free energy change of the reaction. Given the change in enthalpy of 3103 cal and change of entropy of 3.4 cal/K

For a reaction that has ∆H of -30 kJ and ∆S of -62 J/K, estimate at what temperature will the reaction change from spontaneous to non-spontaneous reaction?

Determine change of entropy for a reaction: H2(g) + I2(g) → 2HI(g)

H2(g) - 130.58 I2(J/mol.K)

I2 - 116.73(J/mol.K)

HI(g) - 206.3(J/mol.K) 

Calculate the entropy change for 3 kg of ice melting. Given Hf = 333.5 kJ/kgH20