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Enthalpy Change Calculator

Compute the molar enthalpy change (ΔH) of a chemical reaction from calorimetry data — mass, specific heat, temperature change, and moles of reactant. Used in thermochemistry labs to characterize exothermic and endothermic reactions.

Mass of Substance (g)

Specific Heat Capacity (J/(g·°C))

Temperature Change (ΔT) (°C)

Moles of Reactant (mol)

Calorimeter Type

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Chemistry

Molecular Weight Calculator

Compute the molecular weight (molar mass, g/mol) of a CHON-containing molecule from the number of carbon, hydrogen, oxygen, and nitrogen atoms in its formula, with an optional isotope-correction factor. Useful for routine stoichiometry on organic and biological molecules where C, H, O, and N dominate the elemental composition.

Carbon Atoms (C) (atoms)

Hydrogen Atoms (H) (atoms)

Oxygen Atoms (O) (atoms)

Nitrogen Atoms (N) (atoms)

Isotope Correction

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Key differences

	Enthalpy Change Calculator	Molecular Weight Calculator
Category	Chemistry	Chemistry
Inputs required	5	5
Result	Enthalpy Change per Mole (kJ/mol)	Molecular Weight (g/mol)
What it does	Compute the molar enthalpy change (ΔH) of a chemical reaction from calorimetry data — mass, specific heat, temperature change, and moles of reactant. Used in thermochemistry labs to characterize exothermic and endothermic reactions.	Compute the molecular weight (molar mass, g/mol) of a CHON-containing molecule from the number of carbon, hydrogen, oxygen, and nitrogen atoms in its formula, with an optional isotope-correction factor. Useful for routine stoichiometry on organic and biological molecules where C, H, O, and N dominate the elemental composition.