ThermochemistryMedium
Question
The standard enthalpy of formation of a substance
Options
A.is always positive
B.is always negative
C.is zero
D.may be positive, negative or zero
More Thermochemistry Questions
In a flask, colourless N2O4 is in equilibrium with brown coloured NO2. At equilibrium, when the flask is heated at 373 K...In the exothermic reaction, the enthalpy of reaction is always :...Consider the following isomerization process.CH2=CH–CH2–CH=CH2(g) → CH2=CH–CH=CH–CH3(g)Which of the following statement(...50.0 mL of 0.10 M HCl is mixed with 50.0 mL of 0.10 M NaOH. The solution′s temperature rises by 3.0oC. Calculate t...The standard heat of formation of carbon atom in gaseous state in kJ/mol is - áƒHo (atomisation of CO gas) = 1072 kJ/mo...