Question

A 200 g piece of iron is heated to 100°C. It is then dropped into water to bring its temperature down to 22°C. What is the amount of heat transferred to water? (ciron = 0.444 J/g°C)

Answer 1

H = mcdT.. = 0.2 * 0.444 * -72 = -6.926

Answer 2

right and the - sign indicates that energy is lost by iron rod in form of heat

Answer 3

yeah.. it does indicate that

theta: final temp - initial temp