Calorimetry Calculator Formula

Understand the math behind the calorimetry calculator. Each variable explained with a worked example.

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Formulas Used

Heat (q)

heat_j = mass * specific_heat * delta_t

Heat

heat_kj = (mass * specific_heat * delta_t) / 1000

Variables

VariableDescriptionDefault
massMass of Solution/Substance(g)100
specific_heatSpecific Heat Capacity(J/(g·K))4.184
delta_tTemperature Change (ΔT)(K)5

How It Works

Calorimetry

Formula

q = m × c × ΔT

Where:

  • q = heat absorbed or released (J)
  • m = mass (g)
  • c = specific heat capacity (J/(g·K))
  • ΔT = temperature change (K or °C)

    • Positive q means heat absorbed (endothermic). Negative q means heat released (exothermic).

    Worked Example

    100 g of water (c = 4.184 J/(g·K)) rises by 5 K.

    mass = 100specific_heat = 4.184delta_t = 5
    1. 01q = m × c × ΔT
    2. 02q = 100 × 4.184 × 5
    3. 03q = 2092 J
    4. 04q = 2.092 kJ

    Frequently Asked Questions

    What is calorimetry?

    Calorimetry is the measurement of heat changes during chemical or physical processes using a device called a calorimeter.

    Why use water in a calorimeter?

    Water has a high specific heat (4.184 J/(g·K)), making it good at absorbing heat. Its properties are also well characterized.

    What is the difference between q and ΔH?

    At constant pressure, q = ΔH. In a bomb calorimeter (constant volume), q = ΔU (internal energy change), which differs slightly from ΔH.

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