250.0 g of hot coffee at 95.0 °C are placed in a 0.2000 kg mug at 20.0 °C. The specific heat of the coffee is 4.00 J/g °C, while that of the mug is 0.80 J/g °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system: mug + coffee?
◦ 61.7 °C
◦ 117 °C
◦ 76.0 °C
◦ 57.5 °C
◦ 84.7 °C