How do you calculate decomposition?
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B.
How do you calculate enthalpy when given pressure and temperature?
This expression is consistent with our definition of enthalpy, where we stated that enthalpy is the heat absorbed or produced during any process that occurs at constant pressure. At constant pressure, the change in the enthalpy of a system is equal to the heat flow: ΔH=qp.
How do you calculate enthalpy from BTU?
Cooling BTUs = CFM x ∆h x 4.5 ∆h = the enthalpy change through the system (we get this number by converting wet bulb readings.) 4.5 = the cooling BTU multiplier at sea level, or . 075-lbs.
Is molar enthalpy the same as enthalpy?
Molar enthalpy is the enthalpy value given per mole. Therefore, the key difference between enthalpy and molar enthalpy is that enthalpy is the total heat content of a thermodynamic system, whereas molar enthalpy is the total heat per mole of reactant in the system.
How long does it take for 75% of the compound to decompose?
Half of what is left decomposes in a time equal to another half-life, so that only one quarter of the original compound remains. We see that 75% of the original compound has decomposed after two half-lives. Thus two half-lives equal one hour, or the half-life of the decay is 30 min.
What is the unit of enthalpy change in chemistry?
⚛ Most commonly, enthalpy change is given in units of kilojoules per mol, kJ mol -1 (or kJ/mol) 4 (See Enthalpy Change Calculations for Chemical Reactions tutorial.)
What is the symbol for enthalpy?
Enthalpy is given the symbol H Enthalpy change refers to the amount of heat released or absorbed when a chemical reaction occurs at constant pressure. Enthalpy change is given the symbol 2 ΔH Enthalpy change for a chemical reaction (ΔH) is defined as the enthalpy of the products…
How do you calculate heat of neutralisation?
Heat of neutralisation can be measured in the school laboratory using a styrofoam cup solution calorimter 1: (i) heat produced = mass of reaction mixture × specific heat capacity of solution × temperature change. (ii) enthalpy change for the reaction = -heat produced.
What are the key concepts of enthalpy?
Key Concepts. The enthalpy of a chemical system refers to the “heat content” of the system. Enthalpy change refers to the amount of heat released or absorbed when a chemical reaction occurs at constant pressure. An exothermic reaction is a chemical reaction or physical change in which heat is released. ⚛ Heat is a product of the reaction.