Question

A student heated 25 mL of water from 10°C to 20°C.

4a. How much energy did she use to heat the water? Remember:
cal = m × ΔΤ.

Answer 1

250 calories

Step-by-step explanation:

To calculate the amount of energy used to heat the water, you need to know the mass of the water and the change in temperature.

Assuming that the water has a density of 1 gram/milliliter, we can calculate the mass of the water by multiplying the volume (25 mL) by the density (1 g/mL), which gives us a mass of 25 grams. The change in temperature, ΔΤ, is the difference between the final temperature and the initial temperature, which in this case is 20°C - 10°C = 10°C.

Now that we have the mass and the change in temperature, we can plug these values into the formula to calculate the amount of energy used to heat the water: cal = 25 g × 10°C = 250 cal.

Therefore, the student used 250 calories of energy to heat the water from 10°C to 20°C.