A 33.7 g silver spoon at 20.9 °C is placed in a cup of coffee at 93.1 °C. A short time later, the spoon is at 86.4 °C. If, during this same time, the temperature of the coffee has fallen by 1.9 °C, what is the mass of the coffee? (csilver = 0.056 cal/g °C and assume ccoffee = 1.0 cal/g °C)