please help with part B

Where k is the Boltzmann constant per molecule (particle), 1.381022J/(K-particle). From this equation the entropy change, S, for a system can be related to the change in the number of microstates as S=klnWtititWfial Part B A gaseous system undergoes a change in temperature and volume. What is the ontropy change for a particle in this system it the final number of microstates is 0.434 times that of the initial number of microstales? Express your answer numerically in joules per kelvin per particle