Answer :
Final answer:
Using the formula for calculating heat, we find that approximately 1.672 kJ of energy was needed to increase the temperature of the 40g of water by 10°C as a result of burning the 10g nut.
Explanation:
The question asks about the amount of heat used when a 10g nut is burned to heat 40g of water from 20°C to 30°C. This problem is navigating through the principles of calorimetry, a branch of thermal physics used to measure the heat of chemical reactions or physical changes.
The formula for calculating heat is Q = mcΔT, where:
- 'Q' is the heat absorbed or released,
- 'm' is the mass of the substance,
- 'c' is the specific heat capacity (for water this is typically 4.18 J/g°C),
- 'ΔT' is the change in temperature.
As the question provides values for 'm' and 'ΔT', we can use these in the formula to find 'Q'. So, Q = (40g)(4.18 J/g°C)(30°C - 20°C) = 1672 J or 1.672 kJ. Therefore, when the nut was lit on fire under the van with 40g of water, approximately 1.672 kJ of energy was required to raise the water's temperature from 20°C to 30°C.
Learn more about calorimetry here:
https://brainly.com/question/34432277
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