To determine whether a shiny gold-colored rock is actually gold, a chemistry student decides to measure its heat capacity. she first weighs the rock and finds that it has a mass of 4.7 g. she then finds that, upon absorption of 52.7 j of heat, the rock undergoes a rise in temperature from 25 ∘c to 57 ∘c. find the specific heat capacity of the substance comprising the rock.