Answer:
See explanation
Explanation:
CO2 reacts with water to form carbonic acid as follows;
CO2(g) + H2O(l) ---------> H2CO3(aq)
This makes the solution more acidic hence it will require more NaOH to reach end point due to the increase in acidity.
Hence, if CO2 is not removed by boiling the solution, a greater amount of NaOH is required to reach end point.
Answer:
The answer to your question is: ΔH = -849.5 KJ/mol
Explanation:
Data
ΔH = ?
H Fe2O3 = -825.5 KJ/mol
H Al2O3 = -1675 KJ/mol
H Al = 0 KJ/mol
H Fe = 0 KJ/ mol
Reaction
2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)
ΔH = H products - H reactants
ΔH = H Al2O3 - H Fe2O3
ΔH = -1675 - (- 825.5)
ΔH = -1675 + 825.5
ΔH = -849.5 KJ/mol
I attached the working and the answer to the question below.
<span>Note that in the formula, C = speed of light, ν = frequency, λ= wavelength
</span><span>
The wavelength of a 4.3 x 10</span>¹⁵<span> /s wave is
6.98 </span>
× 10⁻⁶.