Two substances, a and b, initially at different temperatures, come into contact and reach thermal equilibrium. the mass of substance a is 6.03 g and its initial temperature is 20.3 °c. the mass of substance b is 25.9 g and its initial temperature is 52.4 °c. the final temperature of both substances at thermal equilibrium is 46.2 °c. if the specific heat capacity of substance b is 1.17 j/g·°c, what is the specific heat capacity of substance a?