Question

A sample of graphite with a mass of 15.0 grams drops from an initial temperature of 22°C to a

final temperature of 12°C. Calculate how much heat was transferred, and state whether it was
gained or lost based on the sign of your answer.

Answer 1

106.5 J, and it was lost.

Step-by-step explanation:

To calculate the amount of heat transferred, we can use the following formula:

Q = m * c * ΔT

where Q is the amount of heat transferred, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

For graphite, the specific heat capacity is approximately 0.71 J/g°C.

So we have:

Q = 15.0 g * 0.71 J/g°C * (-10°C)

Q = -106.5 J

The negative sign of the answer indicates that the graphite lost heat, since its temperature decreased. Therefore, the heat was transferred from the graphite to its surroundings.

So the amount of heat transferred from the graphite was 106.5 J, and it was lost.