Calculate the kilocalories needed to heat 170g of water from 15°C to 76°C. Express your answer to two significant figures

Answer 1

From Q = mcΔT, Q = (170g) (4.184 J/g °C) (76 - 15), but 1 calorie = 4.184 J, so Q = (170g) (1 cal/g °C) (61 °C) = [10,370 cal] = 10. kcal, to 2 sig figs.