useunits : true or false show the output with units

explicit : true or false show the output in polynomial form

The Property function returns the thermodynamic data defined in McBride et al. (2002) and data on the molar Gibbs free energy of formation that is derived from it.

The data returned is at the standard state.

If species is a gas, the standard state is 1 bar.

If species is crystalline or liquid, the standard state is 1 atm.

The output parameter is one of Hmolar, Smolar, Cpmolar, MolarMass,  HeatOfFormation or Comments. It can be given as a symbol or a string. Refer to the tables below for alternative names that are accepted by this command.

If output is Hmolar, Gmolar, Smolar or Cpmolar, then an equation of the form temperature=value needs to be supplied.

temperature can be replaced by "temperature", T or "T".

value can be a name, a numeric value, or a numeric value with a unit of K .

If value is a name and explicit is false (the default), then the unevaluated function is returned.

If value is a name and explicit=true or explicit is specified, then an expression in value is returned. The expression is an empirical correlation for output as defined in McBride et al. (2002), or data on the molar Gibbs free energy of formation that is derived from such correlations.

If value is numeric, then it is assumed to be the temperature in Kelvin.

If value is numeric with a unit of K or if useunit=true or useunit is specified, then the result returned by Property will have a unit. No other temperature unit apart from K can be used.

This table describes the results returned by the Property command.

If output is MolarMass or HeatOfFormation, then the following is true.

If the option useunit has the value true, the result returned by the Property command will have a unit.

This table describes the data returned by the Property command.

If output is Comments then additional information (as defined in McBride et al., 2002) about the chemical is returned.

$\mathrm{with}\left(\mathrm{ThermophysicalData}:-\mathrm{Chemicals}\right)$

$\left[\mathrm{GetSpecies}\,\mathrm{Property}\right]$

$\mathrm{Property}\left(\mathrm{Hmolar}\,\mathrm{CO2}\,\mathrm{temperature}=300\right)$

$\mathrm{-393441.2212}$

$\mathrm{Property}\left(\mathrm{Hmolar}\,\mathrm{CO2}\,\mathrm{temperature}=300\mathrm{Unit}\left(K\right)\right)$

$-393441.2212⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{Property}\left(\mathrm{MolarMass}\,\mathrm{CO2}\right)$

$44.0095000$

$\mathrm{Property}\left(\mathrm{MolarMass}\,\mathrm{CO2}\,\mathrm{useunits}\right)$

$44.0095000⟦\frac{g}{\mathrm{mol}}⟧$

$\mathrm{Property}\left(''Hmolar''\,''CO2''\,''temperature''=T\,\mathrm{explicit}\right)$

$8.314510T\left(\left\{\begin{array}{cc}-\frac{49436.50540}{T^2}-\frac{626.4116010\ln \left(T\right)}{T}+5.301725240+0.001251906908T-7.091029093\times {10}^{\mathrm{-8}}{T}^2-1.922497195\times {10}^{\mathrm{-10}}{T}^3+5.699355602\times {10}^{\mathrm{-14}}{T}^4-\frac{45281.98460}{T}& 200.000\le T\le 1000.000\\ -\frac{117696.2419}{T^2}-\frac{1788.791477\ln \left(T\right)}{T}+8.291523190-0.00004611578390T+1.621225627\times {10}^{\mathrm{-9}}{T}^2-4.727633280\times {10}^{\mathrm{-13}}{T}^3+1.266007318\times {10}^{\mathrm{-16}}{T}^4-\frac{39083.50590}{T}& 1000.000<T\le 6000.000\\ \frac{1.544423287\times {10}^9}{T^2}+\frac{1.016847056\times {10}^6\ln \left(T\right)}{T}-256.1405230+0.01684700540T-7.270614457\times {10}^{\mathrm{-7}}{T}^2+1.747855210\times {10}^{\mathrm{-11}}{T}^3-1.768470300\times {10}^{\mathrm{-16}}{T}^4-\frac{8.043214510\times {10}^6}{T}& 6000.000<T\le 20000.000\\ \mathrm{undefined}& \mathrm{otherwise}\end{array}\right.\right)$

$\mathrm{fsolve}\left(\mathrm{Property}\left(''Hmolar''\&comma;''CO2''\&comma;''temperature''=T\right)=-393811.1213\mathrm{Unit}\left(\frac{J}{\mathrm{mol}}\right)\&comma;T=280\mathrm{Unit}\left(K\right)\right)$

$289.9999991⟦K⟧$

$\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Simple}\right]\right)\&colon;$

$T≔298.15\mathrm{Unit}\left('K'\right)$

$T≔298.15⟦K⟧$

$\mathrm{h\_N2}≔\mathrm{Property}\left(''Hmolar''\&comma;''N2''\&comma;''temperature''=T\right)\&semi;$$\mathrm{h\_H2}≔\mathrm{Property}\left(''Hmolar''\&comma;''H2''\&comma;''temperature''=T\right)\&semi;$$\mathrm{h\_NH3}≔\mathrm{Property}\left(''Hmolar''\&comma;''NH3''\&comma;''temperature''=T\right)$

$\mathrm{h\_N2}≔9.915884626\times {10}^{\mathrm{-6}}⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{h\_H2}≔-4.957942313\times {10}^{\mathrm{-6}}⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{h\_NH3}≔-45940.00004⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{s\_N2}≔\mathrm{Property}\left(''Smolar''\&comma;''N2''\&comma;''temperature''=T\right)\&semi;$$\mathrm{s\_H2}≔\mathrm{Property}\left(''Smolar''\&comma;''H2''\&comma;''temperature''=T\right)\&semi;$$\mathrm{s\_NH3}≔\mathrm{Property}\left(''Smolar''\&comma;''NH3''\&comma;''temperature''=T\right)$

$\mathrm{s\_N2}≔191.6097115⟦\frac{J}{\mathrm{mol}K}⟧$

$\mathrm{s\_H2}≔130.6810143⟦\frac{J}{\mathrm{mol}K}⟧$

$\mathrm{s\_NH3}≔192.7702891⟦\frac{J}{\mathrm{mol}K}⟧$

$\mathrm{DeltaH}≔0.5\left(2\mathrm{h\_NH3}-\mathrm{h\_N2}-3\mathrm{h\_H2}\right)\&semi;$$\mathrm{DeltaS}≔0.5\left(2\mathrm{s\_NH3}-\mathrm{s\_N2}-3\mathrm{s\_H2}\right)$

$\mathrm{DeltaH}≔-45940.00004⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{DeltaS}≔-99.05608810⟦\frac{J}{\mathrm{mol}K}⟧$

$\mathrm{DeltaG}≔\mathrm{DeltaH}-\mathrm{DeltaS}T$

$\mathrm{DeltaG}≔-16406.42737⟦\frac{J}{\mathrm{mol}}⟧$

$\mathrm{convert}\left(\mathrm{DeltaG}\&comma;'\mathrm{units}'\&comma;\frac{'\mathrm{kJ}'}{'\mathrm{mol}'}\right)$

$-16.40642737⟦\frac{\mathrm{kJ}}{\mathrm{mol}}⟧$

$\mathrm{Property}\left(''Gmolar''\&comma;''NH3''\&comma;''temperature''=T\&comma;'\mathrm{useunits}'\right)$

$-16406.42732⟦\frac{J}{\mathrm{mol}}⟧$

McBride, Bonnie J.; Zehe, Michael J.; and Gordon, Sanford. NASA Glenn Coefficients for Calculating Thermodynamic Properties of Individual Species; 2002; https://www.grc.nasa.gov/WWW/CEAWeb/TP-2002-21556.htm (6 Dec 2017).

The ThermophysicalData:-Chemicals:-Property command was introduced in Maple 2018.

For more information on Maple 2018 changes, see Updates in Maple 2018.

The ThermophysicalData:-Chemicals:-Property command was updated in Maple 2022.

The output option was updated in Maple 2022.