Enthalpy is expressed as Delta H, which is the amount of heat content used or released in a system at constant pressure. Delta H equals change in volume multiplied by the constant pressure of the system plus the change in internal energy.
Know MoreAt constant pressure, the heat flow for the process is also equal to the change in enthalpy. Heat flow is expressed as "q." The relationship between Delta H and q can be determined based on whether the reaction is exothermic or endothermic. If the reaction absorbs heat from the surroundings, it is endothermic, and q is positive. If q is positive, then Delta H is also positive. If the reaction releases heat to its surroundings, it is exothermic, and q is negative. If q is negative, then Delta H is also negative.
Learn more about ChemistryThe enthalpy of dissolution is the change in the thermodynamic potential of a substance when it is dissolved at a constant pressure in a solvent until it reaches an infinite dilution. The enthalpy of dissolution is commonly expressed at a common temperature in kJ/mol.
Full Answer >The chemical reaction for fermentation is expressed as the chemical equation: C6H12O6 ? 2 C2H5OH + 2 CO2. Showing the alcoholic fermentation of glucose as chemical formula C6H12O6, this one glucose molecule is converted into two ethanol molecules expressed as 2C2H5OH and two carbon dioxide molecules expressed as 2CO2.
Full Answer >The percent difference formula for chemistry is expressed as (accepted value - experimental value) / accepted value * 100. Percent difference in chemistry is also called percent error. It is a common calculation that expresses the difference between a measured value and an actual one.
Full Answer >The equation to determine the midpoint is expressed as the sum of x_{1} and x_{2} divided by two for the x-coordinate and the sum of y_{1} and y_{2} divided by two for the y-coordinate. This formula can also be described as finding the average between each point.
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