I believe that the delta h formation or enthalpy of
formation is only zero for pure elements. They are zero because they are the
most basic substances, that is you cannot form an element from an element.
Since Ozone is already a compound, a mixture of 2 oxygen O2 atoms, therefore
the δh∘<span>f is
not necessarily zero.</span>
Answer:
moles are equal to the coefficients infornt of chemical equations knowing the moles can help so much when finding either grams or the volumes
Answer:
5.521 × 10⁻² mol/m².s
Explanation:
Given:
Pressure of the Methane and Helium gas = 101.32 kPa
Temperature of the Methane and Helium gas = 298 K
Partial pressure of Methane, pA₁ = 60.79 kPa
Partial pressure of Methane at point 0.02 m away, pA₂ = 20.26 kPa
Now,
Molar flux is given as:
Here,
= 0.675 × 10⁻⁴ m²/s (for He-CH4 at 101.32 kPa and 298 K)
Z₂ - Z₁ = 0.02 m
R is the ideal gas constant = 8.314 J/mol.K
T is the temperature = 298 K
On substituting the respective values, we get
or
= 5.521 × 10⁻² mol/m².s