Two substances, a and b, initially at different temperatures, come into contact and reach thermal equilibrium. the mass of substance a is 6.07 g and its initial temperature is 20.7 ∘c. the mass of substance b is 26.1 g and its initial temperature is 52.8 ∘c. the final temperature of both substances at thermal equilibrium is 47.0 ∘c. part a if the specific heat capacity of substance b is 1.17 j/g⋅∘c, what is the specific heat capacity of substance a? express your answer using two significant figures.