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Thermodynamics - Work, heat and energy systems.Specific heat of water is 4.19 kJ/kg 0C and the heat required can be calculated asĭQ = (1 litre) (1 kg/litre) (4.19 kJ/kg 0C) ((100 oC) - (0 oC)) One liter of water is heated from 0 oC to boiling 100 oC. Specific heat of aluminum is 0.91 kJ/kg 0C and the heat required can be calculated asĭQ = (2 kg) (0.91 kJ/kg 0C) ((100 oC) - (20 oC)) Online Specific heat capacity unit converterĢ kg of aluminum is heated from 20 oC to 100 oC.1 Btu/lb m oF = 4186.8 J/kg K = 1 kcal/kg oC.Then, the specific heat capacity of methanol is: c p = 81.8 J/(molK) / 32.04 g/mol = 2.53 J/(g K) What is the specific heat capacity, c p?įirst, we calculate (or find) the molar weight of methanol: 1*12.01g/mol C + 4*1.008g/mol H + 1*16.00g/mol O = 32.04 g/mol CH 3OH M = molar weight of the actual substance (g/mol).Įxample: Methanol (with molecular formula CH3OH) has a molar heat capacity, C p, of 81.1 J/(mol K). The specific heat capacity can be calculated from the molar heat capacity, and vise versa:
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Tabulated values of molar heat capacity, C p, of a lot of organic and inorganic substances can be found in Standard enthalpy of formation, Gibbs free energy of formation, entropy and molar heat capacity of organic substances and Standard state and enthalpy of formation, Gibbs free energy of formation, entropy and heat capacity, together with ΔH° f, ΔG° f and S° for the same substances at 25☌.Ĭonverting between Specific heat and Molar heat capacity It is expressed in joules per moles per degrees Kelvin (or Celsius), J/(mol K).Įxample: The molar heat capacity of iron is 25.10 J/(mol K), which means that it takes 25.10 Joules of heat to raise 1 mol of iron by 1 degree Kelvin. Molar Heat Capacity ( C p) is the amount of heat needed to increase the temperature of one mol of a substance by one degree at constant pressure. The Ratio of Specific Heat is expressed as The individual individual gas constant, R, can be expressed as Use the links to see tabulated values of specific heat of gases, common liquids and fluids, food and foodstuff, metals and semimetals, common solids and other common substances. There are two definitions of Specific Heat for vapors and gases:Ĭ p = (δh / δT) p - Specific Heat at constant pressure (J/gK)Ĭ v = ( δh / δT) v - Specific Heat at constant volume (J/gK) Specfic heat and change in Temperature chart (1) can be transferred to express Specific Heat as:Įxample: The specific heat of iron is 0.45 J/(g K), which means that it takes 0.45 Joules of heat to raise one gram of iron by one degree Kelvin.ĭownload and print Heat supplied vs. The heat supplied to a mass can be expressed asĬ = specific heat (J/g K, kJ/kg oC, kJ/kg K, Btu/lb oF) Specific heat is a more common term for the same. Specific Heat Capacity ( c) is the amount of heat required to change the temperature of a mass unit of a substance by one degree. Never use tabulated values of heat capacity without checking the unit of actual values! In some contexts kJ or cal and kcal are used instead of J. In the English system, the units are British thermal units per pound per degree Fahrenheit (Btu/ oF). The SI unit for heat capacity is J/K (joule per kelvin).
The amount of heat supplied to heat an object can be expressed as:Ĭ = heat capacity of system or object (J/K, Btu/ oF) Heat Capacity has the units of energy per degree.Heat Capacity - C - is a characteristic of an object - the amount of heat required to change its temperature by one degree.
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