Question

If 8690 joules of heat is required to raise the temperature of 50g of a substance from 300°c to 400°c then calculate the specific heat of the substance.

Answer 1

Answer:

1.74 cal/g°C

Explanation:

energy required= mass *specific heat * temperature difference

8690 = 50 * specific heat* (400-300)

8690 = 50*specific heat* 100

8690 = 50*100*specific heat

8690 = 5000*specific heat

specific heat = 8690/5000

specific heat = 1.738 = 1.74cal/g°C

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Answer 2

Answer:

Determine whether you want to warm up the sample (give it some thermal energy) or cool it down (take some thermal energy away).

Insert the amount of energy supplied as a positive value. If you want to cool down the sample, insert the subtracted energy as a negative value. For example, say that we want to reduce the sample's thermal energy by 63,000 J. Then Q = -63,000 J.

Decide the temperature difference between the initial and final state of the sample and type it into the heat capacity calculator. If the sample is cooled down, the difference will be negative, and if warmed up - positive. Let's say we want to cool the sample down by 3 degrees. Then ΔT = -3 K. You can also go to advanced mode to type the initial and final values of temperature manually.

Determine the mass of the sample. We will assume m = 5 kg.

Calculate specific heat as c = Q / (mΔT). In our example, it will be equal to c = -63,000 J / (5 kg * -3 K) = 4,200 J/(kg·K). This is the typical heat capacity of water.

If you have problems with the units, feel free to use our temperature conversion or weight conversion calculators.

Heat capacity formula

The formula for specific heat looks like this:

c = Q / (mΔT)

Q is the amount of supplied or subtracted heat (in joules), m is the mass of the sample, and ΔT is the difference between the initial and final temperatures. Heat capacity is measured in J/(kg·K).

Typical values of specific heat

You don't need to use the heat capacity calculator for most common substances. The values of specific heat for some of the most popular ones are listed .